Physics - Sound Wave Question with Solution | TestHub

Beats are the periodic and repeating fluctuations heard in the intensity of a sound when two sound waves of slightly different frequencies interfere with one another.

For the beats to be clearly audible and have maximum contrast between maximum and minimum intensities, the amplitudes of the two superposing waves should be the same or nearly equal.

Therefore, beats are produced when there is a superposition of two sound waves having the same amplitude but slightly different frequencies.

Answer: same amplitude but slightly different frequencies.