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Question

A source of sound is moving towards a platform with a velocity of 100ms–1 If the frequency of sound produced is 200 Hz, find the apparent frequency of the sound observed by an observer standing on the platform velocity of sound = 320m/s).

  1. 250 Hz    
  2. 290.1 Hz    
  3. 340.1 Hz    
  4. 390 Hz    

The correct answer is: 290.1 Hz


    Apparent frequency of soundopen parentheses n to the power of ∣ end exponent close parentheses equals fraction numerator n v over denominator v minus v subscript s end subscript end fraction equals fraction numerator 200 cross times 320 over denominator 320 minus 100 end fraction n to the power of ∣ end exponent equals 290.1 H z

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