A tuning fork gives 5 beats /sec with another fork of 500Hz . When first fork is loaded , then no. of beats /sec remain unchanged. Then frequency of the first fork will be

Explanation

`n_1 = n_2 +- 5 = 500 +-5 =` 505Hz or 495Hz
when `n_1` is loaded its frequency decreases and given that beat frequency remains unchanged. This is possible only when `n_1` = 505Hz.