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QAIPMT-2004-Ph-2654: NEET 2004 Physics - Class 11 AIPMT-2004-Ph-2654 Solution: A car is moving towards a high cliff. The driver sounds a horn…

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

Multiple Choice Options

  • A v/2v/\sqrt{2}
  • B v/3v/3
  • C v/4v/4
  • D v/2v/2

Step-by-Step Verified Solution

Let f' be the frequency of sound heard by cliff. _ f = v f v _ v c    ...(1) Now, for the reflected wave, cliff acts as a source, _ 2 f = f _ ( v + v c ) v    ...(2) 2 f = f ( v + v c ) v _ v c _ 2 v _ 2 v c = v + v c _ v 3 = v c

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