Question

For formation of beats, two sound notes must have ______.

Options

• different amplitudes and different frequencies

• exactly equal frequencies only

• exactly equal amplitudes only

• nearly equal frequencies and equal amplitudes

Answer 1

For formation of beats, two sound notes must have nearly equal frequencies and equal amplitudes.

Explanation:

Because different frequencies are blended in sound notes, beats can only be produced by two sound notes with nearly identical frequencies and amplitudes.