doppler effect is applicable for
a. moving bodies
b. one is moving and other are stationary
c. for relative motion
d. none of these
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Doppler effect is applicable for relative motion.
The Doppler effect for electromagnetic waves such as light is of great use in astronomy and results in either a so-called redshift or blueshift. It has been used to measure the speed at which stars and galaxies are approaching or receding from us; that is, their radial velocities.
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