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Two tuning fork when sounded together, produce 3 `beats//s`. One of the fork is in unison with `27 cm` length of sonometer wire and other with `28 cm` length of the same wire. The frequencies of the two tuning forks areA. `87 , 84 Hz`B. `49, 39 Hz`C. `81, 78 Hz`D. `84, 81 Hz` |
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Answer» Correct Answer - D `n_(1) - n_(2) = 3 "……."(i)` `n prop (1)/(l)` `n_(1)l_(1) = n_(2)l_(2)` `(n_(1))/(n_(2)) = (28)/(27)"…."(2)` Solving these two equation `n_(1) = 84 , n_(2) = 81` |
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