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Question

Two tuning forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these are vibrated together and the beats produced are represented by the line OB. If the frequency of P is 341Hz, the frequency of Q will be

  1. 341 Hz    
  2. 338 Hz    
  3. 344 Hz    
  4. None of the above    

The correct answer is: 344 Hz


    n subscript Q end subscript equals 341 plus-or-minus 3 equals 344 H z or 338 H z
    on waxing Q, the number of beats decreases hence n subscript Q end subscript equals 344 H z

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