question_answer

The beats are not heard, if the difference in frequencies of the two sounding notes is more than 10. Why?                     

Answer:

                If the difference in frequencies of the two waves is more than 10, we shall hear more than 10 beats per second. Due to persistence of hearing, our ear is notable to distinguish between two sounds as separate if the time interval between them is less than \[\text{(1/10) th}\] of a second. Hence beats heard will not be distinct if the number of beats produced per second is more than 10.