InterviewSolution
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InterviewSolution
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Two sources of sound placed close to each other are wmitting progressive waves given by `y_1=4sin600pit` and `y_2=5sin608pit`. An observer located near these two sources of sound will hear:A. `4` beats per second with intensity ratio `25 : 16` between waxing and waningB. `8` beats per second with intensity ratio `25 : 16` between waxing and waningC. `8` beats per second with intensity ratio `81 : 1` between waxing and waningD. `4` beats per second with intensity ratio `81 : 1` between waxing and waning |
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Answer» Correct Answer - D `y_(1) = 4 sin 600 pi t = A_(1) sin 2 pi f_(1) t` `A_(1) = 4, f_(1) = 300 Hz` `y_(2) = 5 sin 608 pi t = A_(2) sin 2pi f_(2) t` `A_(2) = 5, f_(2) = 304 Hz` Beat frequency `= f_(1)~f_(2) = 4 Hz` `(I_(max))/(I_(min)) = ((A_(1)+A_(2))/(A_(1)~A_(2)))^(2) = ((4+5)/(4~5))^(2) = (81)/(1)` |
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