A sound sourse S and observers `O_(1),O_(2)` are placed as shown S is always at rest and `O_(1),O_(2)` start moving with velocity `v_(0)` at t=0 at any later instant let `f_(1)` ans `f_(2)` represent apparent frequencies of sound received by `O_(1) and O_(2)` respectively the ratio `f_(1)//f_(2)` is

Options

A. zero
B. between 0 and 1
C. 1
D. `ge1`

Answer

D

Explanation

`f_(1)=f[(v-v_(0)costheta)/v]....(1)`
`f_(2)=f[(v-v_(0))/v]...(2)`
`:. f_(1)/f_(2) = (v-v_(0)costheta)/(v-v_(0))ge1`