Question

When a source is moving and observer is stationary. The quantity whose change causes Doppler Effect is
a) velocity of sound
b) wavelength
c) both velocity and wavelength
d) None

Answer 1

Answer:

none is the answer okk ..

Answer 2

Explanation:

Explanation:The reason for the Doppler effect is that when the source of the waves is moving towards the observer, each successive wave crest is emitted from a position closer to the observer than the crest of the previous wave.