Waves And Oscillations

The tuning fork of frequency 288 Hz is producing 4 beats/sec with the unknown tuning fork i.e., the frequency difference between them is 4. Therefore, the frequency of unknown tuning fork On placing a little wax on unknown tuning fork, its frequency decreases but now the number of beats produced per second is 2 i.e. the frequency difference now decreases. It is possible only when before placing the wax, the frequency of unknown fork is greater than the frequency of given tuning fork. Hence, the frequency of unknown tuning fork