A curve is plotted to represenet the dependence of the ratio of the received frequency `f` to the frequency `f_0` emitted by the source on the ratio of the speed of obsever `V_(ob)` to the speed of sound `V_(sound)` in a situation in which an observer is moving towards a stationary sound source. The curve is best represnted by :

Options

A.
B.
C.
D.

Answer

A

Explanation

`f=f_0(1+(V_(ob))/(V_(sound)))implies(f)/(f_0)=1+(V_(ob))/(V_(sound))` (straight line),
when `(V_(ob))/(V_(sound))=0`,`(f)/(f_0)=1`
and as `(V_(ob))/(V_(sound))rarr1implies(f)/(f_0)rarr2`