Astronomy notes on Light
Astronomy notes on Light ASTR 1307
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This 7 page Class Notes was uploaded by Perla Notetaker on Friday October 2, 2015. The Class Notes belongs to ASTR 1307 at University of Texas at El Paso taught by Noriega-Mendoza, Hector in Fall 2015. Since its upload, it has received 109 views. For similar materials see Elem Astronomy-Solar System in Physical Education at University of Texas at El Paso.
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Date Created: 10/02/15
How can we produce light 0 By accelerating chargers electrons protons Sound requires a medium to be transported light does not How fast does light travel in space 0 300000 kms 0 Light travels 75 times around the Earth in one second 0 Nothing can travel faster than the speed of light 0 Light has a fast finite speed meaning that light cannot travel infinitely fast Roemer s observation 0 Roemer became the first person to measure the speed of light by timing eclipses of Jupiter39s moons Light and its properties Radiation re ection and refraction of light Light is radiated to space by the objects that create it stars light bulbs etc and travels in straight lines It can then be re ected by planetary atmospheres and surfaces by mirrors etc or refracted by planetary atmospheres by prisms by water etc The energy radiated or transmitted in the form of rays waves or particles The return of light or sound waves from a surface an image produced by or as if by a mirror mm i g iists39idfm Fug W mf d far1quot The angle of incidence equals the angle of re ection Angle of incidence quot i I r I 39 mirmiw Whenever light passes from one medium to another having a different density Star appears to be here Actual position of star We can interpret light in two ways light behaves like 0 A particle photon 0 A wave Light behaves both like a particle and a wave depending on how we observe it 0 energy E 0 frequency f 0 wavelength A 0 Speed of light c 0 Light travels at c300000 kms To calculate the speed of light we just multiply frequency times wavelength c f 1 speed of light frequency wavelength The distance between two crests How fast the wave oscillates The number of waves passing any point each second Long Short Wave Wave Length Length Fran Haney r i i wsEliil EliE lg l Low Frequency 1 High Frequency Low Energy High Energy Breaking up light into more colors Hail Grange Vell nw Green Blue a Indigo Wallet Light 5355 Prism The different forms of light create the Electromagnetic spectrum Visible Light 700mm 600nm 500nm 400nm Ti Radio waves Microwaves Infrared Ultraviolet xrays Gamma H l H I lquot H iquot 1 h 1 ll l I LONGER 39WAVELENGTH Imete rs SHORTER gt I I I I I I I I I I I I I I I I I 102 11 1 101 102 103 104 105 106 107 108 109 mm 10 1012 1013 0 Gamma Rays Has the highest energy light highest frequency shortest wavelengths 0 Radio waves Has the lowest energy light lowest frequency longest wavelengths 0 We can only see the Visible Light 0 All types of light travel at the same speed Optical window Ranges from 4000 A to 7000 A angstroms Stars are black bodies A perfect emitter of light A star that has collapsed they are very small and dense and difficult to detect because of low luminosity Most light produced by a star is ejected into space In our sun green yellow light dominates over the rest of the colors Peak emission MaX point Peak wavelength Defines the temperature and color of the source depending on where the peak occurs Big and hot objects have greater luminosity Temp determines the color of a star Blue colors Higher temperatures Red colors Cooler temperatures AIAAIAAIAIA Energy output T Wavelength Hotterltri 7 fr 7 f i i 7 gt Cooler Wien s law 3107 A maX T T Temperature in Kelvin degrees A maX Peak wavelength in angstroms A o 10 1 A 10 meters EX The temperature of the Sun 5800 k Determine its color in angstroms that is what s the Sun s peak wavelength T 5800K A max 3107 AmaX T 3107 AmaX 5800 300001xxgt AInaX 5800 AmaX 517258 Same peak L I I Luminosity I I I I I I I I T Wavelength fferent peak wavelength I D 4 Star A L r StarA has the same peak wavelength as Star B Meaning they are the same color and same temperature StarA is brighter than B If both stars are the same color and temperature Wh y does StarA have a higher luminosity brighter than Star B That is because Star A is bigger in size StarA has a different peallt wavelength than Star D Meaning they are different color and temperature Star D is cool and red StarA is hot and blue If Star A is hotter than Star D it should have a higher luminosity but Wh y do both stars have the same luminosity are equally bright That means Star D is bigger in size Luminosity Star D Wavelength
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