The observed change in the wavelength of light due to the Doppler effect occurs
A) only when the temperature of an object changes.
B) only when the light source has proper motion (i.e., motion across the line of sight).
C) whenever the light source is moving with respect to the observer (regardless of direction).
D) only when the light source has a radial velocity (i.e., motion toward or away from the observer).

Question

Quizplus · Accepted Answer

The Answer of The observed change in the wavelength of light due to the Doppler effect occurs
A) only when the temperature of an object changes.
B) only when the light source has proper motion (i.e., motion across the line of sight).
C) whenever the light source is moving with respect to the observer (regardless of direction).
D) only when the light source has a radial velocity (i.e., motion toward or away from the observer).

The Observed Change in the Wavelength of Light Due to the Doppler