A sound source is moving towards stationary listener with `(1)/(10)th` of the speed of sound. The ratio of apparent to real frequency is

Options

A. `((9)/(10))^(2)`
B. `(10)/(9)`
C. `(11)/(10)`
D. `((11)/(10))^(2)`

Answer

B

Explanation

`n.=(v-0)/(v-(v)/(10))xxn" "therefore (n.)/(n)=(v)/(9v//10)=(10)/(9)`.