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

Short/Brief Note

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

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Chapter 5: Acoustics - Evaluation [Page 71]

Chapter 5 Acoustics
Evaluation | Q VII. 5. | Page 71

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