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Question

A closed pipe is suddenly opened and changed to an open pipe of same length. The funda-mental frequency of the resulting open pipe is less than that of 3rd hoarmonic of the ear-lier closed pipe by 55Hz. Then, the value of fundamental frequency of the closed pipe is

  1. 165Hz    
  2. 100Hz    
  3. 55Hz    
  4. 220Hz    

The correct answer is: 55Hz

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