If a source of light is moved away from a stationary observer, then the frequency of light wave appears to change because of:
A. interference
B. diffraction.
C. Doppler’s effect
D. All of these
Answer:C
If a source of light is moved away from a stationary observer, then the frequency of light wave appears to change because of:
A. interference B. diffraction. C. Doppler’s effect D. All of these