Determine unknown frequency with the help of beats

Two frequencies sounded together produce 3 beats per second.If one of the frequencies is 400 vibrations per second,the other frequency will be?

Asked Tayyab Mynir

Answer:

There are two possibilities because the beat frequency is equal to the difference in frequencies of the two sounding bodies.

So, the unknown frequency can be either 397 Hz or 403 Hz. This can be verified by lagging/ loading one of the sounding bodies.

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