Two sound waves of the same frequency can interfere, but, in order to produce beats, the two sound waves must be of different frequencies. Why?
Solution 46E Any two waves with same or nearly same frequency can interfere. The resultant will be constructive or destructive interference depending on their phase difference. In beats, two waves with slightly different frequencies interfere and result in a wave of alternatively high and low amplitude. The beat is measured by the difference in two frequencies.