ASTRO-110 Lecture Notes - Lecture 7: Redshift, Photon, Blueshift
18 Sep 2020
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Light emitted from an obj moving towards you will have its wavelength shortened. Light emitted from an obj moving away from you will have its wavelengths. Light emitted from an object moving perpendicular to your line-of-sight will not change its wavelength. Change in / = v / c lengthened redshift. If obj moving away from observer positive velocity. If obj is moving towards observer negatice velocity. We can measure the doppler shift of emission or absorption lines in a spectrum. We can calculate the velocity of the object in the direction either towards or away. Measuring radial velocity from earth (radial velocity) Theory of quantum mechanics electrons in atoms can have only a certain specific energies. Each element has a different set of such allowed energies. Kirchoff"s laws continuous spectrum, emission lines, absorption lines. Wien"s law hotter things radiate more light (t4) and bluer light. Doppler effect light is shifted to bluer or redder wavelengths depending on.
