Physics · Wave Motion and Sound
Which of the following statements is FALSE regarding the conditions under which NO Doppler effect (no change in observed frequency) is observed? 1. The listener is at rest and the source moves directly towards the listener. 2. The source and listener move in such a way that the distance between them remains constant. 3. The source and listener are moving in mutually perpendicular directions at the point of closest approach. 4. The source is situated at the centre of a circle along which the listener is moving.
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1 only
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