3 If separation between a source and a detector changes due to relative motion between them the detector detects sound of pitch

Question

3 If separation between a source and a detector changes due to relative motion between them the detector detects sound of pitch different from that emitted by the source This observed change in pitch is known as Doppler s shift and the effect is known as Doppler s effect Under the conditions when Doppler s shift is observed intensity of the sound also changes In this task we study change in intensity of sound detected by a detector due to relative motion between a source and a detector A point source is emitting sound isotropically at constant power P and the sound travels with velocity c relative to the air a A detector is moving with a constant velocity v towards a stationary source in still air Find suitable expression for intensity I of sound received by the detector at a distance r from the source b A point source is moving with a constant veloci owards a stationary detector in still air Find suitable expression for intensity I of sound received by the detector at a distance r from the source

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