Question
Physics Question on sound
A man is watching two trains, one leaving and the other coming in with equal speeds of 4m/sec. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m/sec) will be equal to
A
6
B
3
C
0
D
12
Answer
6
Explanation
Solution
The correct option is(A): 6