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Question

S1 and S2 are two coherent sources of sound separated by distance 100.25 lambda, where lambda is the wave length of sound. S1 leads S2 in phase by pi/4. A and B are two points on the line joining S1 and S2 as shown in figure. The ratio of amplitudes of source S1 and S2 are in ratio 1:2. The ratio of intensity at A to that of B open parentheses fraction numerator I subscript A end subscript over denominator I subscript B end subscript end fraction close parentheses is

  1. ¥    
  2. 1/9    
  3. 0    
  4. 9    

The correct answer is: 1/9

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