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Question

The number of beats produced per second by two vibrations: x1 =x0 sin 646pt and x2 = x0 sin 652 pt is

  1. 2    
  2. 3    
  3. 4    
  4. 6    

The correct answer is: 3


    From the given equation omega subscript 1 end subscript equals 2 pi n subscript 1 end subscript equals 646 piÞn subscript 1 end subscript equals 323
    and omega subscript 2 end subscript equals 2 pi n subscript 2 end subscript equals 652 pi Þ n subscript 2 end subscript equals 326
    Hence, beat frequency equals 326 minus 326 equals 3

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