A man is watching two trains , one leaving and the other coming in with equal speed of 4m .s^(-1) . If they sound their whistles , each of frequency 240 Hz , find the number of beats heard by the man (velocity of sound in air = 320 ms^(-1) ).

A man is watching two trains , one leaving and the other coming in wit

1.	A man is watching two trains , one leaving and the other coming in with equal speed of 4m .s^(-1) . If they sound their whistles , each of frequency 240 Hz , find the number of beats heard by the man (velocity of sound in air = 320 ms^(-1) ).
Answer» SOLUTION :N/A