Question

13. Doppler effect of sound is not experienced by the listener when the scenes and
the source of sound move with the same speed and in the same direction. Why?

Answer 1

Explanation:

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave (or another periodic event) for an observer moving relative to its source.

So if both listener and source of sound are stationary or are moving with the same velocity that is relative velocity is zero, there won't be any change in frequency.

Thus, in this case, the effect will arise when a listener is moving towards the source of the sound.

Answer 2

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