Question

Two sources of sound have the following sets of frequencies. If sound is produced by each pair, which set give rise to beats?

• A. 26 Hz and 512 Hz
• B. 256 Hz and 256 Hz
• C. 380 Hz and 385 Hz
• D. all of these

Answer 1

Answer:

C. 380 Hz and 385 Hz

Beats are a phenomenon that occurs when two sounds with slightly different frequencies are produced simultaneously, resulting in a periodic variation in amplitude.

• Condition for Beats:

For beats to occur, the two sources of sound must have frequencies that are close to each other but not identical.

• Given Frequencies:

  The given frequencies are 380 Hz and 385 Hz.

• Difference in Frequencies:

The difference between the two frequencies is 5 Hz.

• Production of Beats:

  Since the difference between the two frequencies is small (5 Hz), beats will be produced when sound is generated by each pair.

• Beat Frequency:

  The beat frequency is equal to the difference between the two frequencies, which is 5 Hz.