Two sources of sound S1 and S2 are producing the sound waves of same frequency 670 Hz. A person is moving from S1 towards S2 with a constant velocity u. If the person hears 20 beats, then find the speed of the person. (Take speed of sound = 335 m/sec)
1
10 m/sec
2
5 m/sec
3
2.5 m/sec
4
None of these