If the pitch of the sound of a source appears to drop by`10%` to a moving person, then determine the velocity of motion of the person. Velocity of sound =`300ms^(-1)`.

Options

A. `30ms^(-1)`
B. `11ms^(-1)`
C. `35ms^(-1)`
D. `33ms^(-1)`

Answer

D

Explanation

Apparent frequency `v.-((v-v_(0))/v)v`
`=(v.)/v=(v-v_(0))/vimplies90/100=(330-v_(0))/330`
[As pitch of the sound of a source is dropped by 10%]
`implies330-v_(0)=9xx33`
`impliesv_(0)=33ms^(-1)`