Question

Consider the phenomenon of beats & select the correct statement.

(a) It occurs when frequencies are close or equal

(b) It correspond to the change in intensity we hear due to interference of 2 waves having close frequencies

(c) It corresponds to a constant intensity sound heard during wave interference

(d) Beat frequency is variable

Answer 1

The correct answer is (b) It correspond to the change in intensity we hear due to interference of 2 waves having close frequencies

Best explanation: When two waves with close, but not equal, frequencies interfere, beats are produced. They have a frequency equal to the average frequency of the two interfering waves and we recognize them as the variable intensity sound we hear.