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NEET2017PhysicsWaves and SoundActual

Two cars moving in opposite directions approach each other with speed of 22   m   s - 1 and 16.5   m   s - 1 respectively. The driver of the first car blows a horn having a frequency 400     Hz . The frequency heard by the driver of the second car is [velocity of sound 340   m   s - 1 ]

Options

  1. A350    Hz
  2. B361    Hz
  3. C411    Hz
  4. D448    Hz

Correct answer

D. 448    Hz

Step-by-step solution

Due to Doppler’s effect, when both observer and source are moving towards each other, then, the frequency measured by the observer differs from the actual frequency generated by the source. Thus, the apparent frequency, f A = f v + v 0 v - v s = 400   340 + 16.5 340 - 22 f A = 448   Hz

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