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NEET2002PhysicsWaves and SoundActual

A whistle revolves in a circle with angular speed =20 rad s ⁻¹ using a string of length 50 ~cm . If the frequency of sound from the whistle is 385 ~Hz , then what is the minimum frequency heard by an observer which is away from the centre (v_ sound =340 ~ms ⁻¹ ) ?

Options

  1. A385 ~Hz
  2. B375 ~Hz
  3. C394 ~Hz
  4. D333 ~Hz

Correct answer

B. 375 ~Hz

Step-by-step solution

Velocity of source is given as gathered V_ source = rus =0.5 20 =10 ~ms ⁻¹ gathered Minimum frequency is f ~min aligned & = ( V V+V_s ) f & = 340 340+10 385=374 ~Hz aligned

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