While standing on railway platform and heating the whistle
of an engine coming towards us , we hear the sound
increasing; bit when the engine is receding from us it
appears to fall why ?
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Answer / guest
When the source of sound is moving, the wave length,
frequency and velocity of sound waves alter or appear to
alter, (It is called Doppler Effect).
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1 Answers IGCAR, SG Phyto Pharma,
Organic Chemistry 
