Question

4 tuning forks of frequencies 200, 201, 204, 206 find beat

Answer 1

The interference tone between 200 and 201 will be one beat per second. Also the interference between 201 and 204. The interference between 200 and 204¹ will be two beats per second.

Assuming that all the interference patterns were synchronized, you would hear beats two per second, but one would be much louder than the other, since it would be reinforced two more times.

But what are the chances all the patterns would be synchronized? If they weren’t then you would hear in any one second 2 beats plus 1 beat plus 1 beat for a total of four per second, and they wouldn’t be regularly spaced, either, except by the wildest coincidence (except for the 2 beat interference, which will be 2 even beats per second.)