Beats — a periodic rise and fall in loudness — are produced by?

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1. Beats — a periodic rise and fall in loudness — are produced by?

Diffraction of a single wave

Destructive interference alone

Superposition of two sound waves with nearly equal, but slightly different, frequencies

Reflection of a wave off a distant surface

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Beats arise when two sound waves of nearly equal frequency overlap. Their combined amplitude periodically rises and falls, heard as a throbbing variation in loudness.