AIPMT | 2014Sound WavesHard

Question

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

Options

A.1332 Hz
B.1372 Hz
C.1412 Hz
D.1454 Hz

Solution

u0 = 36 km/h = 10 m/s     us = 18 km/h = 5 m/s
               
f′ = f = 1392 × Hz
= 1392 × Hz = 1412 Hz

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