Waves - Result Question 71

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

[2014]

(a) 1332Hz

(b) 1372Hz

(c) 1412Hz

(d) 1464Hz

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Answer:

Correct Answer: 73. (c)

Solution:

  1. (c) According to Doppler’s effect Apparent frequency,

n=n(v+v0v+vs)=1392(343+10343+5).

=1412Hz



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