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Explain the conditions for no Doppler effect.

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Under the following circumstances, there will be no Doppler effect and the apparent frequency as heard by the listener will be the same as the source frequency.

1. When source (S) and listener (L) both are at rest. 

2. When S and L move in such a way that distance between them remains constant. 

3. When source S and L are moving in mutually perpendicular directions.

4. If the source is situated at the center of the circle along which the listener is moving.

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