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Question

The frequencies of two sound sources are 256 Hz and 260 Hz. At t = 0, the intensity of sound is maximum. Then the phase difference at the time t = 116  sec will be 


  1. Zero

  2.  

  3.  


Solution

The correct option is D

 


Time interval between two comsecutive beats 

T = 1n1n2=1260256=14sec , t=116=T4 sec 

By using time difference = T2π×phase 

difference T4=T2π×ϕϕ=π2 

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