Question

Choose the correct statement.

• A. Beats are due to destructive interference
• B. Maximum beat frequency audible to a human being is $20$
• C. Beats are a result of Doppler’s effect
• D. Beats are due to the superposition of two waves of nearly equal frequencies

Answer 1

The correct option is D

Beats are due to the superposition of two waves of nearly equal frequencies

Explanation for the correct answer

Option $\left(D\right)$- Beats is due to the superposition of two waves of nearly equal frequencies

1. Beats are often observed between two vibrations with a similar frequency of the beating signal.
2. When sound signals interfere, the beat signal can sometimes be heard.
3. Beat is an interference pattern between the two sounds of slightly different frequencies.

Explanation for the incorrect answer

Option $\left(A\right)$- Beats can be produced by alternating constructive and destructive interference.

Option $\left(B\right)$- The maximum number of beat frequencies that can be heard by a human being is $10soundse{c}^{-1}$.

Option $\left(C\right)$-The Doppler effect is the change in the frequency of a wave in relation to an observer who is moving relative to the wave source. Beats are not the result of the Doppler effect.

Therefore, beats are due to the superposition of two waves of nearly equal frequencies