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NEET2009PhysicsWaves and SoundActual

The driver of a car traveling with speed 30 m / sec towards a hill sounds a horn of frequency 600 ~Hz . If the velocity of sound in air is 330 m / s , the frequency of reflected sound as heard by driver is :

Options

  1. A500 ~Hz
  2. B550 ~Hz
  3. C555.5 ~Hz
  4. D720 ~Hz

Correct answer

D. 720 ~Hz

Step-by-step solution

aligned n ^ & =v ( c + u c - u ) & =600 ( 330+30 330-30 )=720 ~Hz aligned

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