Let's say you have two tuning forks which are supposed to produce the same frequency, 512 Hz. One is of good quality, but the other is cheaply made and vibrates at 510 Hz. If you bonk them both how many beats per second will you hear

= 2 beats per seconds

Explanation:

From |f - f'| = modulus of the difference between the frequency given. f = 510Hz and f' = 512Hz Difference between the frequency will give us the number of beat per seconds. i. e 2 beats per seconds

These also shows how to get the period of the tuning forks.