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Mention two cases in which there is no D...

Mention two cases in which there is no Doppler effect in sound?

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(i) When source (S) and listener(L) both are at rest.
(ii) When S and L move in such a way that distance between them remains constant.
(iii) When source Sand L are moving in mutually perpendicular directions.
(iv) If the source is situated at the center of the circle along which the listener is moving.
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