AST 111 Lecture Notes - Lecture 20: Electromagnetism, Tunxis Community College, Christian Doppler
18 Dec 2020
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Document Summary
The same shift occurs whether or not it is the observer or object that is moving. Doppler effect is seen in electromagnetic waves with light. Light coming towards us has a shorter wavelength than normal. Redshift changes towards longer wavelengths, where blue is shorter. Most red/blue shifts caused by doppler are relatively small. Measuring the amount of shifting of stellar lines helps determine the radial velocity of the star relative to earth. Radial velocity- velocity component along the line of sight from th e observer. Tangential velocity- velocity component perpendicular to the line of sight. Doppler effect does not allow us to measure this. Rotation rates of the planets and the rings of saturn. Speed measured by the doppler effect is the speed of the object relative to the speed of the earth. Galilean relativity/newtonian relativity- relativity of small speeds to the speed of light.
