waves

Question: A source of sound and listener are approaching each other with a speed of 40 m/s. The apparent frequency of note produced by the source is 400 cps. Then, its true frequency (in cps) is (velocity of sound in air = 360 m/s)



1) 420
2) 360
3) 400
4) 320
Solution: Explanation: No Explanation
Doppler Effect

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