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NEET2004PhysicsWaves and SoundActual

A car is moving towards a high cliff. The driver sounds a horn of frequency f . The reflected sound herd by the driver has frequency 2 f . If v is velocity of sound, then the velocity of the car, in the same velocity units, will be:

Options

  1. Av 2
  2. Bv 3
  3. Cv 4
  4. Dv 2

Correct answer

B. v 3

Step-by-step solution

According to given condition Cliff is stationary source of frequency f where f= ( V+V_ car v ) f^ Frequency heard by the drives array rlrl f^ = ( V+V_ car v-v_ car ) f^1= ( V+V_ car v-v_ car ) f & =2 f & V+V_ car & =2 V-2 v_ car & 3 v_ car & =V & V_ car & = v 3 array

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