A) diffraction
B) destructive interference
C) constructive and destructive interferer.:*
D) superposition of two waves of nearly frequencies
Correct Answer: D
Solution :
When two sound waves of nearly equal frequencies are produced simultaneously, then the intensity of the resultant sound produced by their superposition increases and decreases alternately with time. This rise and fall in the intensity of sound is called the phenomenon of beats. One rise and one fall form one beat. The number of times the intensity of sound rises and falls in one second is called beat frequency.
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