Two sources of sound and produce sound waves of same frequency 660 Hz

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

Two sources of sound

S_1

and

S_2

produce sound waves of same frequency 660 Hz. A listener is moving from source

S_1

towards

S_2

with a constant speed

u

m/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then

u

equals: (1) 5.5 m/s (2) 15.0 m/s (3) 2.5 m/s (4) 10.0 m/s