A sound source is moving towards a stationary observer with 1/10 of the speed of sound. The ratio of apparent to real frequency is

Options

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

Answer

A

Explanation

We use
`n' = n((v)/(v - v_(S))) = n((v)/(v - v//10))`
`(n')/(n) = (10)/(9)`