two sound sources are moving in oppostive directions with velocities ` v_(1) and v_(2) ( v_(1) gt v_(2))` . Both are moving away from a stationary observer. The frequency of both the sources is 900 Hz. What is the value of ` v_(1) - v_(2)` so that the beat frequency aboserved by the observer is 6 Hz. speed of sound v= 300 m/s given ,that `v_(1) and v_(2) lt lt v `

Options

A. `1m//s`
B. `2m//s`
C. `3m//s`
D. `4m//s`

Answer

B

Explanation

`f_(1)=900((300)/(300+V_(1)))" "f_(2)=900((300)/(300+V_(2)))" "f_(2)-f_(1)=6`
`implies V_(1)-V_(2)=2m//s`