Beats are the result of

Diffraction

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Destructive interference

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Constructive and destructive interference

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Superposition of two waves of nearly equal frequencies

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Solution

The correct option is D Superposition of two waves of nearly equal frequencies
Beats is the superposition of two waves of nearly equal frequencies. When the two tones are close in pitch but not identical, the difference in frequency generates the beating. The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively.

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