Light, Energy, and Telescopes
Light, Energy, and Telescopes AY 101
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This 2 page One Day of Notes was uploaded by Alyssa Hendrixson on Monday January 26, 2015. The One Day of Notes belongs to AY 101 at University of Alabama - Tuscaloosa taught by Dean Martin Townsley in Winter2015. Since its upload, it has received 121 views. For similar materials see Introduction to Astronomy in Physics 2 at University of Alabama - Tuscaloosa.
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Date Created: 01/26/15
AY 101 Lecture Notes Monday January 26 2015 Light Energy and Telescopes Nature of light 0 Fundamental forces Gravitational force 0 Holds planets ion orbit Weakest force attractive only Electromagnetic force 0 Holds YOU together 0 Most relevant to the everyday world Weak nuclear force Strong nuclear force 0 Holds a nucleus together Where does light come from What us an electromagnetic wave 0 Light Electrical force 0 Strength decreases with distance like gravity Strength proportional to charge Opposite charges attract Same charges repel There are two charges 0 Positive 0 Negative Magnetic Force 0 Additional force if charges are moving 0 Strength and direction are fairly complicated It turns out that electrical and magnetic elds can create each other without charges around too This can lead to waves Electromagnetic radiation 0 Electromagnetic waves Electric quot eldquot is quotwhat would be the electric force if there were a charge herequot Finite time to propagation leads to quotwavesquot Waves create light Speed is the same Frequency is measured in Hertz cycles per second Wavelength is the distance of the electric eld which varies Energy Energy content of light Shorter wavelength higher energy light Sunscreen is transparent to quotvisible lightquot but it re ects ultraviolet UV light AY 101 Lecture Notes 0 Violet is the shortest visible wavelength 0 Ultraviolet shorter wavelength than violet UV is energetic enough to damage your skin while visible light is not Shorter wavelength or higher frequency means higher energy per photon X rays are even more dangerous but radio waves are harmless very low energy per photon Photons Particles of light 0 Massless but still have and experience gravity 0 Move at the speed of light in a vacuum 0 Energy of a photon higher for short wavelength high frequency radiation 0 We detect single photons all the time Waveparticle nature 0 Both matter and light behave somewhat like a wave and somewhat like a particle 0 Particle nature most important at quotlow intensityquot Telescopes o Atmospheric absorption and telescopes Many wavelengths outside the optical are absorbed by the atmosphere This makes it necessary to have satellites and rocketand ballooncarried detectors 0 Light bucket Want to capture as much light as possible Larger telescopes will capture more light than a small telescope
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