1.

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`

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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