Two tuning forks A and B give 4 beats//...

Two tuning forks `A and B` give ` 4 beats//s` when sounded together . The frequency of `A is 320 Hz`. When some wax is added to `B` and it is sounded with `A , 4 beats//s per second` are again heard . The frequency of `B` is

312 Hz

316 Hz

324 Hz

328 Hz

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The correct Answer is:

`n_A - n_B = x` (same) ….(i) `to` Wrong
`nB darr - n_A = x` (same ) ….(ii) `to` Correct
`rArr n_B=n_A + x = 320+4`= 324 Hz

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