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. `((10)/(9))^(2)`
C. `((11)/(10))^(2)`
D. `(1)/(10)`

Answer

C

Explanation

When source is moving towards the stationary listener, the apparent frequency is
`upsilon.=(vxxupsilon)/(v-v_(s))=(v)/(v-(v)/(10))upsilon=(10)/(9)upsilon or(upsilon.)/(upsilon)=(10)/(9)`