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KVPY2013PhysicsWaves and Sound

An engine moving away from a vertical cliff blows a born at a frequency f. Its speed is 0.5 % of the speed of sound in air. The frequency of the reflected sound received at the engine is

Options

  1. A0.990 f
  2. B0.995 f
  3. C1.005 f
  4. D1.010 f

Correct answer

A. 0.990 f

Step-by-step solution

f₁=f₀ [ v v+v_ s ]f_ R =f₁ [ v-v_ s v ]=f₀ [ v-v_ s v+v_ s ]= [1- 2 v_ s v ] f=0.990 f

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