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JIPMER2004PhysicsWaves and Sound

A siren emitting sound of frequency 500 Hz is going away from a stationary listener with a speed of 50 ~m / s , the frequency of sound heard directly from the siren is

Options

  1. A286.5 Hz
  2. B481 Hz
  3. C434.2 Hz
  4. D580 Hz

Correct answer

C. 434.2 Hz

Step-by-step solution

Here: Frequency of siren =500 ~Hz The speed of siren v_s=50 ~m / s Using Doppler's principle n^ = v v+v_s n or n^ = ( 330 330+50 ) 500 or n^ = 330 500 380 = 434.2 ~Hz

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