A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 k m / h o u r . He finds that traffic has eased and a car moving ahead of him at 18 k m / h o u r is honking at a frequency of 1392 H z . If the speed of sound is 343 m / s , the frequency of the honk as heard by him will be:

Question

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 k m / h o u r . He finds that traffic has eased and a car moving ahead of him at 18 k m / h o u r is honking at a frequency of 1392 H z . If the speed of sound is 343 m / s , the frequency of the honk as heard by him will be:, 1332 H z, 1372 H z, 1412 H z, 1454 H z

MARKS App · Accepted Answer

Apparent frequency heard by the observer is given by, f ' = f 0 V - V 0 V - V s Where, f 0 is the original frequency. V is the velocity of sound. V 0 is the velocity of the observer. V s is the velocity of source f ' = 1392 343 - - 10 343 - - 5 = 1412 H z

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