What is Light
What is Light Astr 1010-100
Popular in Introductory Astronomy 1
Popular in Astronomy
This 3 page Class Notes was uploaded by Alyssa Karounos on Friday February 6, 2015. The Class Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 97 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.
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Date Created: 02/06/15
22 15 1 Goals A Relate the three main types of spectra to the physical situations that form spectra B Relate spectral lines and atomic structure 11 Rainbows and Prisms A prisms split light B Newton experimented with light 1 does the prism dilute the colors or reveal them C prisms can turn white light into different colors D colors are an essential part of light 111 The Electromagnetic Spectrum A spectrum order of colors form from one to the next B measure quality of light in wavelength C each color has a different wavelength D there are colors of light and form of light we can t see Gamma Ultraviolet Infrared Rays XRays Rays Rays Radar FM TV Shortwave AMI 1 x 10114 1 x 1ch12 1 x 108 1x 104 1 x 102 1 x 102 1 x 104 Wavelength in meters Visible Light 4 x 1oT 5 x 10T 6 x 1oT z x 10I Wavelength in meters E High Energy Low Energy IV Photons A little packages of energy B Einstein discovered that different light holds more energy 1 Blue photons hold more energy than red photons C Look at the types of light you get 1 How much red and how much blue V Thermal Radiation A making a rainbow I grab something opaque not colorful 2 make it hot 3 add a prism B Color is quick measure of temperature 1 red 3000K 2 yellow 5500K 3 blue 3000OK C called Wien s Laws VI Which spectrum is from the hottest object A blue light is hottest B peak of spectrum towards bluehottests C towards red not as energetic D blue shorter wavelengths E red longer wavelengths VII Atoms A 1841 Fraunhofer studies dark lines in the solar spectrum 1 lines from the sun not lamplight 2 absorption line spectrum because it absorbs the light B Kirchhoff and Bunsen 1 emission light 2 light that is emitted C Kirchhoffs laws 1 starlight prism spectrum continuum spectrum 2 starlight then cloud of cool gas cooler than the sun prism absorption light 3 starlight gas from the side prism emission spectrum Continuum oootrurn Emission Lif39lE S JEEU39LHTI 5 Colo Gas Absorption Li 3 Spectrum of If E o a m 1 12 a 4 all depends where you look 5 the different gas would emit different light 6 Tell how much stuff is burning millions of miles away D Why do chemicals emit such narrow colors of light elections prefer the ground state of an atom a Without added energy if given energy in the form of a photon they can only raise to another energy state or get rid of the energy through light Red lst state Blue 2nd state Can do nothing with yellow because you can t hold or store it