A whistle giving out `450 H_(Z)` approaches a stationary observer at a speed of `33 m//s`. The frequency heard the observer (in `H_(Z)`) is (speed of sound `= 330 m//s`)

Options

A. 409
B. 429
C. 517
D. 500

Answer

D

Explanation

`f'=f[(v)/(v-v_1)]=450[(330)/(330-33)]=500 Hz`