AP Physics 1 B6/7
Assignments -- 3rd Quarter
Jan 6th to Mar 11th -- 2015-2016
Thur, Jan 7
Due:
- Reading Activity 6-1 to 6-2 Agenda: - Even More Acceleration Lab Questions - Physics Day Lab Questions - Centripetal Acceleration Lab Questions - Lsn 6-1 to 6-2 Lecture Assignment: - Complete Even More Acceleration Lab - Complete Physics Day Lab - Complete Centripetal Acceleration Lab - HW Lsn 6-1 to 6-2, #1-14 - Reading Activity 6-3 6-Word Memoir: No sorry I don’t play basketball |
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Thought for the Day: If Barbie is so popular, why do you have to buy her friends?
Peter Sorokin
"I think we all felt that... this was the subject to focus on," Sorokin said. "We started thinking, 'How are we going to make a laser?' and the word 'laser' wasn't even there yet." Physicist Gordon Gould hadn't yet coined the term. "It just seemed like the thing to do. The sky was the limit."
From a vantage point of fifty years, he now looks back on his rough graduate school days not with pain, but with pride."The fact that I almost quit, but then found something just following my own hunches, gave me a lot of confidence, and I've retained that confidence all through my career," he said. "That experience set my course in science".
From: http://www.physicscentral.com/explore/people/sorokin.cfm.html
From a vantage point of fifty years, he now looks back on his rough graduate school days not with pain, but with pride."The fact that I almost quit, but then found something just following my own hunches, gave me a lot of confidence, and I've retained that confidence all through my career," he said. "That experience set my course in science".
From: http://www.physicscentral.com/explore/people/sorokin.cfm.html
Peter Sorokin with the flash lamp-pumped
dye laser, in 1968. Photo courtesy of IBM |
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Mon, Jan 11
Due:
- Even More Acceleration Lab - Physics Day Lab - Centripetal Acceleration Lab - HW Lsn 6-1 to 6-2, #1-14 - Reading Activity 6-3 Agenda: - Finish Lsn 6-1 to 6-3 Lecture - Review HW Lsn 6-1 to 6-2, #1-14 - Lsn 6-3 Lecture Assignment: - HW Lsn 6-3, #15-24 - Reading Activity 6-4 to 6-5 6-Word Memoir: Okay I guess. Probably not standard.
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Wed, Jan 13
Due:
- HW Lsn 6-3, #15-24 - Reading Activity 6-4 to 6-5 Agenda: - Review HW Lsn 6-3, #15-24 - Lsn 6-4 to 6-5 Lecture Assignment: - HW Lsn 6-4 to 6-5, #26-32 - Reading Activity 6-6 to 6-7 6-Word Memoir: Suffered from life, excelled past everything
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Fri, Jan 15
Due:
- HW Lsn 6-4 to 6-5, #26-32 - Reading Activity 6-6 to 6-7 Agenda: - Review HW Lsn 6-4 to 6-5, #26-32 - Lsn 6-6 to 6-7 Lecture Assignment: - HW Lsn 6-6 to 6-7, #33-44 - Reading Activity 6-8 to 6-9 6-Word Memoir: The time won't stop flying by
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Words of Wisdom: Eagles may soar, but weasels don't get sucked into jet engines.
Famous Dead Guys - Henry CavendishThe English chemist and physicist Henry Cavendish, was the first to recognize hydrogen gas as a distinct substance. He also described the composition of water and made the first accurate measurement of the density of the Earth. He measured heats of fusion and evaporation as well as specific heats and those of the mixing of solutions in water. Cavendish's measurements of the freezing points of various solutions showed the existence of compositions that yield maximum and minimum freezing points.Cavendish compared the electrical conductivities of equivalent solutions of electrolytes and expressed a version of Ohm's law. His last major work was the first measurement of Sir Isaac Newton's gravitational constant, together with the mass and density of the Earth. The accuracy of this experiment was not improved on for nearly a century.
From: http://www.chemistry.mtu.edu/~pcharles/SCIHISTORY/HenryCavendish.html |
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Wed, Jan 20
Due:
- HW Lsn 6-6 to 6-7, #33-44 - Reading Activity 6-8 to 6-9 Agenda: - Review HW Lsn 6-6 to 6-7, #33-44 - Lsn 6-8 to 6-9 Lecture Assignment: - HW Lsn 6-8 to 6-9, #47-54 - Reading Activity 6-10 6-Word Memoir: A world of fun and adventure |
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Fri, Jan 22
Due:
- HW Lsn 6-8 to 6-9, #47-54 - Reading Activity 6-10 Agenda: - Review HW Lsn 6-8 to 6-9, #47-54 - Lsn 6-10 Lecture Assignment: - HW Lsn 6-10, #58-70 6-Word Memoir: Active childhood, not as much now |
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Thought for the Week: What happens if you get scared half to death twice?
Prof. Nicola SpaldinWhen Prof. Nicola Spaldin was growing up in the British mountains where her "parents ran a hiking center," it was apparent that she loved the outdoors and discovering her surroundings. She was not a stranger to being in the open air and quickly became an avid climber, backcountry skier and mountaineer, "It's something I've always done," she said. After graduating in 1991, Spaldin became a PhD candidate in chemistry at the University of California - Berkeley. When Prof. Spaldin was asked how she became a physicist after having most of her academic background in chemistry, she replied, "I kind of drifted into it. Looking back, I was always heading towards materials physics, I just didn't know that what I was doing was called that." Like her varied background, Prof. Spaldin spends her time researching how to get materials to do multiple tasks. But more importantly, Prof. Spaldin was able to discover her passion, something that she lives her life by. She says, "Do what you're passionate about. If you're passionate about physics, do it. It may not be the easiest choice, but it will be the most rewarding." Prof. Spaldin is about to move from UC Santa Barbara to ETH Zürich where she will be Chair of Materials Theory in the Department of Materials. "It's time for new adventures!" she says.
From: http://www.physicscentral.com/explore/people/spaldin.cfm |
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Tue, Jan 26
Due:
- HW Lsn 6-10, #58-70 Agenda: - Review HW Lsn 6-10, #58-70 - PhET Energy Skate Park Lab Assignment: - Complete PhET Energy Skate Park Lab - Chapter 6 Test Review 6-Word Memoir: Anything is more fun than homework |
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Thu, Jan 28
Due:
- PhET Energy Skate Park Lab - Chapter 6 Test Review Agenda: - Review Chapter 6 Test Review - Conservation of Energy Lab Assignment: - Complete Conservation of Energy Lab - Study for Chapter 6 Test 6-Word Memoir: Average life of a non-average girl |
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Thought for the Day: Why do psychics have to ask you for your name?
People In Physics - Carol Paty
Carol Paty, a professor at Georgia Institute of Technology, spends her days figuring out how plasmas in space interact with the atmospheres around various planets and their moons. “I really like taking physics and applying it to big problems that you can observe with spacecraft,” she says.
So it was natural that by the time she was in middle school she knew she planned to go to college and study physics. Paty majored in physics at Bryn Mawr College. During that time, she spent a semester abroad in Scotland, where she happened to take a class in solar magnetohydrodynamics, and she was in love with the subject. “I thought wow, this is a really exciting field, this whole study of space plasma physics,” she recalls.
Paty runs 3-dimensional plasma dynamic computer models called multi-fluid simulations. These simulations simultaneously track the various components of a space plasma, including electrons and different ion species, which make up the environment around a planet or its moon. The model tracks differential motions of these charged particles as coupled to the electric and magnetic fields. These are determined by the four laws of electricity and magnetism known as Maxwell's equations. The models can become quite complex. There are magnetic fields intrinsic to the planet or moon. In addition, there are also dynamic fields created by the motion of electrons and ions.
From: http://www.physicscentral.com/explore/people/paty.cfm
So it was natural that by the time she was in middle school she knew she planned to go to college and study physics. Paty majored in physics at Bryn Mawr College. During that time, she spent a semester abroad in Scotland, where she happened to take a class in solar magnetohydrodynamics, and she was in love with the subject. “I thought wow, this is a really exciting field, this whole study of space plasma physics,” she recalls.
Paty runs 3-dimensional plasma dynamic computer models called multi-fluid simulations. These simulations simultaneously track the various components of a space plasma, including electrons and different ion species, which make up the environment around a planet or its moon. The model tracks differential motions of these charged particles as coupled to the electric and magnetic fields. These are determined by the four laws of electricity and magnetism known as Maxwell's equations. The models can become quite complex. There are magnetic fields intrinsic to the planet or moon. In addition, there are also dynamic fields created by the motion of electrons and ions.
From: http://www.physicscentral.com/explore/people/paty.cfm
Mon, Feb 1
Due:
- Chapter 6 Test Review Agenda: - Chapter 6 Test - Conservation of Energy Lab Questions Assignment: - Complete Conservation of Energy Lab - Reading Activity 7-1 to 7-3 6-Word Memoir: Hardship opens the door for opportunity
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Wed, Feb 3
Due:
- Conservation of Energy Lab - Reading Activity 7-1 to 7-3 Agenda: - Lsn 7-1 to 7-3 Lecture Assignment: - HW Lsn 7-1 to 7-3, #1-12 and 15-20 - Reading Activity 7-4 to 7-6 6-Word Memoir: Heart of Lion. Ban from zoos.
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Fri, Feb 5
Due:
- HW Lsn 7-1 to 7-3, #1-12 and 15-20 - Reading Activity 7-4 to 7-6 Agenda: - Review HW Lsn 7-1 to 7-3, #1-12 and 15-20 - Lsn 7-4 to 7-6 Lecture Assignment: - HW Lsn 7-4 to 7-6, #22-28 and 31-38 - Chapter 7 Test Review 6-Word Memoir: Hey look, he finally stopped laughing
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Words of Wisdom: A conclusion is the place where you got tired of thinking.
Famous Dead Guys -- Jean Baptiste Joseph Fourier (1768 - 1830)
In 1798 Fourier joined Napoleon's army in its invasion of Egypt as scientific adviser. Fourier acted as an administrator as French type political institutions and administration was set up. In particular he helped establish educational facilities in Egypt and carried out archaeological explorations. While in Cairo Fourier helped found the Cairo Institute and was one of the twelve members of the mathematics division, the others included Monge, Malus and Napoleon himself. Fourier was elected secretary to the Institute, a position he continued to hold during the entire French occupation of Egypt. Fourier was also put in charge of collating the scientific and literary discoveries made during the time in Egypt. Fourier returned to France in 1801 with the remains of the expeditionary force and resumed his post as Professor of Analysis at the École Polytechnique. However Napoleon had other ideas about how Fourier might serve him and wrote:- ... the Prefect of the Department of Isère having recently died, I would like to express my confidence in citizen Fourier by appointing him to this place.
Fourier was not happy at the prospect of leaving the academic world and Paris but could not refuse Napoleon's request. He went to Grenoble where his duties as Prefect were many and varied. It was during his time in Grenoble that Fourier did his important mathematical work on the theory of heat. His work on the topic began around 1804 and by 1807 he had completed his important memoir On the Propagation of Heat in Solid Bodies. Now this memoir is very highly regarded but at the time it caused controversy. There were two reasons for the committee to feel unhappy with the work. The first objection, made by Lagrange and Laplace in 1808, was to Fourier's expansions of functions as trigonometrical series, what we now call Fourier series. Further clarification by Fourier still failed to convince them.
With this rather mixed report there was no move in Paris to publish Fourier's work. Fourier was elected to the Académie des Sciences in 1817. Shortly after Fourier became Secretary, the Académie published his prize winning essay Théorie analytique de la chaleur in 1822. During Fourier's eight last years in Paris he resumed his mathematical researches and published a number of papers, some in pure mathematics while some were on applied mathematical topics. His life was not without problems however since his theory of heat still provoked controversy. Fourier wrote Historical Précis as a reply to these claims but, although the work was shown to various mathematicians, it was never published. Fourier's work provided the impetus for later work on trigonometric series and the theory of functions of a real variable.
From: http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Fourier.html
Fourier was not happy at the prospect of leaving the academic world and Paris but could not refuse Napoleon's request. He went to Grenoble where his duties as Prefect were many and varied. It was during his time in Grenoble that Fourier did his important mathematical work on the theory of heat. His work on the topic began around 1804 and by 1807 he had completed his important memoir On the Propagation of Heat in Solid Bodies. Now this memoir is very highly regarded but at the time it caused controversy. There were two reasons for the committee to feel unhappy with the work. The first objection, made by Lagrange and Laplace in 1808, was to Fourier's expansions of functions as trigonometrical series, what we now call Fourier series. Further clarification by Fourier still failed to convince them.
With this rather mixed report there was no move in Paris to publish Fourier's work. Fourier was elected to the Académie des Sciences in 1817. Shortly after Fourier became Secretary, the Académie published his prize winning essay Théorie analytique de la chaleur in 1822. During Fourier's eight last years in Paris he resumed his mathematical researches and published a number of papers, some in pure mathematics while some were on applied mathematical topics. His life was not without problems however since his theory of heat still provoked controversy. Fourier wrote Historical Précis as a reply to these claims but, although the work was shown to various mathematicians, it was never published. Fourier's work provided the impetus for later work on trigonometric series and the theory of functions of a real variable.
From: http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Fourier.html
Tue, Feb 9
Due:
- HW Lsn 7-4 to 7-6, #22-28 and 31-38 Agenda: - Review HW Lsn 7-4 to 7-6, #22-28 and 31-38 - PhET Center of Mass and Momentum Lab Assignment: - Complete PhET Center of Mass and Momentum Lab - Chapter 7 Test Review 6-Word Memoir: High school student now 11th grade |
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Thu, Feb 11
Due:
- Chapter 7 Test Review Agenda: - Review Chapter 7 Test Review - PhET Center of Mass and Momentum Lab Questions - Ballistic Pendulum Lab Assignment: - Complete PhET Center of Mass and Momentum Lab - Complete Ballistic Pendulum Lab - Study for Chapter 7 Test 6-Word Memoir: How did I mess that up? |
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Words of Wisdom: Experience is something you don't get until just after you need it.
Carbon nanotubes are allotropes of carbon with a cylindrical nanostructure. Nanotubes have been constructed with length-to-diameter ratio of up to 132,000,000:1, significantly larger than for any other material. These cylindrical carbonmolecules have unusual properties, which are valuable for nanotechnology, electronics, optics and other fields of materials science and technology. In particular, owing to their extraordinary thermal conductivity and mechanical and electrical properties, carbon nanotubes find applications as additives to various structural materials. Their name is derived from their long, hollow structure with the walls formed by one-atom-thick sheets of carbon, called graphene. Individual nanotubes naturally align themselves into "ropes" held together by van der Waals forces, more specifically, pi-stacking. Applied quantum chemistry, specifically, orbital hybridization best describes chemical bonding in nanotubes. The chemical bonding of nanotubes is composed entirely of sp2 bonds, similar to those of graphite. These bonds, which are stronger than the sp3 bonds found in alkanes, provide nanotubules with their unique strength.
From: http://en.wikipedia.org/wiki/Carbon_nanotube
From: http://en.wikipedia.org/wiki/Carbon_nanotube
Tues, Feb 16
Due:
- Chapter 7 Test Review Agenda: - Chapter 7 Test Assignment: - Complete PhET Center of Mass and Momentum Lab - Complete Ballistic Pendulum Lab - Reading Activity 8-1 to 8-3 6-Word Memoir: I have done this 3 times |
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Thu, Feb 18
Due:
- Reading Activity 8-1 to 8-3 - PhET Center of Mass and Momentum Lab Agenda: - Lesson 8-1 to 8-3 Lecture - A Look At Gravity Waves - Ballistic Pendulum Lab Questions Assignment: - Complete Ballistic Pendulum Lab - HW Lsn 8-1 to 8-3, #1-13 and 15-21 - Reading Activity 8-4 6-Word Memoir: I hope it all pays off |
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Words of Wisdom: The severity of the itch is proportional to the reach.
Gravitational Waves Detected
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A century after Albert Einstein rewrote our understanding of space and time, physicists have confirmed one of the most elusive predictions of his general theory of relativity. In another galaxy, a billion or so light-years away, two black holes collided, shaking the fabric of spacetime. Here on Earth, two giant detectors on opposite sides of the United States quivered as gravitational waves washed over them. After decades trying to directly detect the waves, the recently upgraded Laser Interferometer Gravitational-Wave Observatory, now known as Advanced LIGO, appears to have succeeded, ushering in a new era of astronomy.
What are gravitational waves?
Colossal cosmic collisions and stellar explosions can rattle spacetime itself. General relativity predicts that ripples in the fabric of spacetime radiate energy away from such catastrophes. The ripples are subtle; by the time they reach Earth, some compress spacetime by as little as one ten-thousandth the width of a proton.
How are they detected?
To spot a signal, LIGO uses a special mirror to split a beam of laser light and sends the beams down two 4-kilometer-long arms, at a 90 degree angle to each other. After ricocheting back and forth 400 times, turning each beam’s journey into a 1,600 kilometer round-trip, the light recombines near its source. The experiment is designed so that, in normal conditions, the light waves cancel one another out when they recombine, sending no light signal to the nearby detector. But a gravitational wave stretches one tube while squeezing the other, altering the distance the two beams travel relative to each other. Because of this difference in distance, the recombining waves are no longer perfectly aligned and therefore don’t cancel out. The detector picks up a faint glow, signaling a passing wave. LIGO has one detector in Louisiana and another in Washington to ensure the wave is not a local phenomenon and to help locate its source.
Gravity waves from black holes verify Einstein’s prediction
https://www.sciencenews.org/article/gravity-waves-black-holes-verify-einsteins-prediction
The long road to detecting gravity waves
https://www.sciencenews.org/article/long-road-detecting-gravity-waves
Gravitational waves explained
https://www.sciencenews.org/article/gravitational-waves-explained
Video: What are gravitational waves?
https://www.youtube.com/watch?v=HwC5IYw5uAE&utm_source=Society+for+Science+Newsletters&utm_campaign=1308960052-gravitational_wave_special_2_11_2016&utm_medium=email&utm_term=0_a4c415a67f-1308960052-104535497
What are gravitational waves?
Colossal cosmic collisions and stellar explosions can rattle spacetime itself. General relativity predicts that ripples in the fabric of spacetime radiate energy away from such catastrophes. The ripples are subtle; by the time they reach Earth, some compress spacetime by as little as one ten-thousandth the width of a proton.
How are they detected?
To spot a signal, LIGO uses a special mirror to split a beam of laser light and sends the beams down two 4-kilometer-long arms, at a 90 degree angle to each other. After ricocheting back and forth 400 times, turning each beam’s journey into a 1,600 kilometer round-trip, the light recombines near its source. The experiment is designed so that, in normal conditions, the light waves cancel one another out when they recombine, sending no light signal to the nearby detector. But a gravitational wave stretches one tube while squeezing the other, altering the distance the two beams travel relative to each other. Because of this difference in distance, the recombining waves are no longer perfectly aligned and therefore don’t cancel out. The detector picks up a faint glow, signaling a passing wave. LIGO has one detector in Louisiana and another in Washington to ensure the wave is not a local phenomenon and to help locate its source.
Gravity waves from black holes verify Einstein’s prediction
https://www.sciencenews.org/article/gravity-waves-black-holes-verify-einsteins-prediction
The long road to detecting gravity waves
https://www.sciencenews.org/article/long-road-detecting-gravity-waves
Gravitational waves explained
https://www.sciencenews.org/article/gravitational-waves-explained
Video: What are gravitational waves?
https://www.youtube.com/watch?v=HwC5IYw5uAE&utm_source=Society+for+Science+Newsletters&utm_campaign=1308960052-gravitational_wave_special_2_11_2016&utm_medium=email&utm_term=0_a4c415a67f-1308960052-104535497
Mon, Feb 22
Due:
- HW Lsn 8-1 to 8-3, #1-13 and 15-21 - Reading Activity 8-4 - Ballistic Pendulum Lab Agenda: - Review HW Lsn 8-1 to 8-3, #1-13 and 15-21 - Lesson 8-4 Lecture Assignment: - HW Lsn 8-4, #22-26 - Reading Activity 8-5 to 8-6 6-Word Memoir: My name is almost always mispronounced
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Wed, Feb 24
Due:
- HW Lsn 8-4, #22-26 - Reading Activity 8-5 to 8-6 Agenda: - Review HW Lsn 8-4, #22-26 - Lesson 8-5 to 8-6 Lecture Assignment: - HW Lsn 8-5 to 8-6, #27-40 - Reading Activity 8-7 6-Word Memoir: No sorry I don’t play basketball
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Fri, Feb 26
Due:
- HW Lsn 8-5 to 8-6, #27-40 - Reading Activity 8-7 Agenda: - Review HW Lsn 8-5 to 8-6, #27-40 - Lesson 8-7 Lecture Assignment: - HW Lsn 8-7, #43-48 - Reading Activity 8-8 6-Word Memoir: My right hand… my go to
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Words of Wisdom: Change is inevitable....except from vending machines.
Physics in Action - Nano Cupcakes
For a while carbon nanotubes have been a hot topic in science. Some of the latest research on nanotubes done at the US National Institute of Standards and Technology in Boulder, CO are fondly called Cupcakes, but you may only want a mental bite of these!
The big deal about terahertz radiation
What is a terahertz? Tera stands for one trillion (1,000,000,000,000). Hertz is a measure of frequency, how many cycles go by per second. Terahertz radiation is any electromagnetic wave that has a range of frequencies within the trillions of cycles per second. This range is sometimes called the submillimeter range, because it corresponds to electromagnetic waves whose wavelengths are smaller than a millimeter. What makes terahertz radiation so interesting is that it can go through many materials like cloth, paper, plastic, wood, ceramic, fog, and even chocolate. They can also use it to look under plaster on buildings, see if there is an unwanted object in your chocolate, or to see if someone has weapons concealed under their clothing. It is often used in astronomy and environmental science to measure the presence of certain molecules.
The big deal about carbon nanotube cupcakes
If scientists are going to use terahertz radiation they need to be able to measure it. At the National Institute of Standards and Technology at Boulder, CO, Dr. Lehman's group is working on ways to measure properties of terahertz lasers. They decided to use nanotubes as a coating on a detector to try to enhance the detector's ability to measure the energy radiated on it by a terahertz laser. The best detector would be able to absorb all the energy radiated on it and transform it to something measurable, like an electric current. These "cupcakes" absorbed almost all the terahertz radiation from a laser with a frequency of 0.76 terahertz, which is in the far infrared region. It turns out that the longer the nanotubes were in the cupcake, the more laser light (radiation) it absorbed. Remember that these carbon nanotubes are just a coating on a detector. Their job is to enhance the detector. As these cupcakes absorb the laser light they warm up. They are also highly conductive, so they transfer almost all the heat energy they absorbed to the detector below them, with only a small amount getting transferred to the air surrounding them.
Future research and applications
Measurement is fundamental to physics. Creating a better detector increases accuracy and precision in measurements taken. Scientists are planning on determining how the absorption of terahertz radiation by these multi-walled carbon nanotube cupcakes is affected by polarization and other terahertz radiation frequencies. The eventual development of improved detectors will be used in measuring many forms of radiant energy on detectors in many different platforms such as: optical-fiber communication systems, photovoltaic and solar-thermal efficiency, satellite-based temperature sensors, as well as in the manufacturing of lasers.
From: http://www.physicscentral.com/explore/action/nano-cupcakes1.cfm
The big deal about terahertz radiation
What is a terahertz? Tera stands for one trillion (1,000,000,000,000). Hertz is a measure of frequency, how many cycles go by per second. Terahertz radiation is any electromagnetic wave that has a range of frequencies within the trillions of cycles per second. This range is sometimes called the submillimeter range, because it corresponds to electromagnetic waves whose wavelengths are smaller than a millimeter. What makes terahertz radiation so interesting is that it can go through many materials like cloth, paper, plastic, wood, ceramic, fog, and even chocolate. They can also use it to look under plaster on buildings, see if there is an unwanted object in your chocolate, or to see if someone has weapons concealed under their clothing. It is often used in astronomy and environmental science to measure the presence of certain molecules.
The big deal about carbon nanotube cupcakes
If scientists are going to use terahertz radiation they need to be able to measure it. At the National Institute of Standards and Technology at Boulder, CO, Dr. Lehman's group is working on ways to measure properties of terahertz lasers. They decided to use nanotubes as a coating on a detector to try to enhance the detector's ability to measure the energy radiated on it by a terahertz laser. The best detector would be able to absorb all the energy radiated on it and transform it to something measurable, like an electric current. These "cupcakes" absorbed almost all the terahertz radiation from a laser with a frequency of 0.76 terahertz, which is in the far infrared region. It turns out that the longer the nanotubes were in the cupcake, the more laser light (radiation) it absorbed. Remember that these carbon nanotubes are just a coating on a detector. Their job is to enhance the detector. As these cupcakes absorb the laser light they warm up. They are also highly conductive, so they transfer almost all the heat energy they absorbed to the detector below them, with only a small amount getting transferred to the air surrounding them.
Future research and applications
Measurement is fundamental to physics. Creating a better detector increases accuracy and precision in measurements taken. Scientists are planning on determining how the absorption of terahertz radiation by these multi-walled carbon nanotube cupcakes is affected by polarization and other terahertz radiation frequencies. The eventual development of improved detectors will be used in measuring many forms of radiant energy on detectors in many different platforms such as: optical-fiber communication systems, photovoltaic and solar-thermal efficiency, satellite-based temperature sensors, as well as in the manufacturing of lasers.
From: http://www.physicscentral.com/explore/action/nano-cupcakes1.cfm
Tues, Mar 1
Due:
- HW Lsn 8-7, #43-48 - Reading Activity 8-8 Agenda: - Review HW Lsn 8-7, #43-48 - Lesson 8-8 Lecture Assignment: - HW Lsn 8-8, #51-64 - Chapter 8 Test Review 6-Word Memoir: Okay I guess. Probably not standard. |
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Thu, Mar 3
Due:
- HW Lsn 8-8, #51-64 - Chapter 8 Test Review Agenda: - Review HW Lsn 8-8, #51-64 - Review Chapter 8 Test Review Assignment: - Study for Chapter 8 Test 6-Word Memoir: School, TV, Baseball, Running, Eat, Sleep |
Thought for Today: Plan to be spontaneous tomorrow.
Mar 11 is the last day of the third grading period!!!
It’s Raining Antimatter… Upward?
Thunder… lightning…gamma rays! Terrestrial gamma-ray flashes (TGFs) are brief bursts of gamma rays produced inside thunderstorms and associated with lightning. NASA's Fermi Gamma-ray Space Telescope detected beams of antimatter produced above thunderstorms, evidence that thunderstorms may make antimatter particle beams.
Scientists believe TGFs come from strong electric fields at the tops of thunderstorms where the field becomes strong enough that it pushes electrons upwards, where the electrons reach speeds almost as fast as light. These electrons give off gamma rays when they're diverted by air molecules and then are detected as a TGF.
The electrons produce so many gamma rays that they shoot electrons and positrons out of the atmosphere and NASA’s Fermi Gamma-ray Space Telescope intercepts these particles, showing evidence that thunderstorms may be producing antimatter.
Scientists believe TGFs come from strong electric fields at the tops of thunderstorms where the field becomes strong enough that it pushes electrons upwards, where the electrons reach speeds almost as fast as light. These electrons give off gamma rays when they're diverted by air molecules and then are detected as a TGF.
The electrons produce so many gamma rays that they shoot electrons and positrons out of the atmosphere and NASA’s Fermi Gamma-ray Space Telescope intercepts these particles, showing evidence that thunderstorms may be producing antimatter.
Mon, Mar 7
Due:
- Chapter 8 Test Review Agenda: - Chapter 8 Test Assignment: - Reading Activity 11-1 to 11-3 6-Word Memoir: “I’ll stop procrastinating next week mom”
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Wed, Mar 9
Due:
- Reading Activity 11-1 to 11-3 Agenda: - Lecture Lsn 11-1 to 11-3 Assignment: - HW Lsn 11-1 to 11-3, #1-25 - Reading Activity 11-4 6-Word Memoir: A large collection of adventurous moments
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Fri, Mar 11
Due:
- HW Lsn 11-1 to 11-3, #1-25 - Reading Activity 11-4 Agenda: - Review HW Lsn 11-1 to 11-3, #1-25 - Lecture Lsn 11-4 Assignment: - HW Lsn 11-4, #28-34 - Reading Activity 11-7 to 11-9 6-Word Memoir: A world of fun and adventure
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Words of Wisdom: Cross country skiing is great if you live in a small country.
People in Physics - Major Matthew H. Briggs
Since earning my B.S. in Physics from the University of Alabama in 1997 I have committed the last 10 years as a pilot in the USAF. I began my post-training AF career at Little Rock AFB, AR as a co-pilot and then aircraft commander in the C-130 Hercules. I followed that assignment with a three year tour to Ramstein AB, Germany as an instructor pilot in the C-130. During my time as a C-130 pilot I deployed numerous times to the Middle East and eastern Europe in support of Operations Joint Forge, Joint Guardian, Southern Watch, Enduring Freedom and Iraqi Freedom and to Antarctica in support of Operation Deep Freeze.
During my overseas tour I applied and was accepted to the U-2 high-altitude reconnaissance community at Beale AFB, CA. My missions consist of 1-hour pre-breathing of 100% oxygen in a full-pressure suit (same ones worn by NASA Astronauts) followed by 10-12 hour missions above 70,000 feet—"Alone, Unarmed, and Unafraid". Each day the U-2 "Dragonlady" proves to be the most challenging aircraft to fly and employ. "I work outside the "traditional" physics community, but my academic background certainly helped me attain my goals."
From: http://www.physicscentral.com/explore/people/briggs.cfm
During my overseas tour I applied and was accepted to the U-2 high-altitude reconnaissance community at Beale AFB, CA. My missions consist of 1-hour pre-breathing of 100% oxygen in a full-pressure suit (same ones worn by NASA Astronauts) followed by 10-12 hour missions above 70,000 feet—"Alone, Unarmed, and Unafraid". Each day the U-2 "Dragonlady" proves to be the most challenging aircraft to fly and employ. "I work outside the "traditional" physics community, but my academic background certainly helped me attain my goals."
From: http://www.physicscentral.com/explore/people/briggs.cfm