The answer to this question would be A. Interference. This is because when two sounds with slightly different frequencies creates a periodic variation in volume.
Interference interaction of sound waves causes beats.
Answer: Option A
<u>Explanation:</u>
When two sound waves interact with each other, a new wave is produced which is due to the interference between the sound waves. Beats are produced due to interference in sound waves where waves might be of different frequency but of same amplitude.
There are two types of interference called as constructive and destructive interference depending upon either the resultant amplitude is smaller or larger.
