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NEET2014PhysicsWaves and SoundActual

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:

Options

  1. A1332 H z
  2. B1372 H z
  3. C1412 H z
  4. D1454 H z

Correct answer

C. 1412 H z

Step-by-step solution

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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