Question

A source of sound of frequency 450 cycles/sec is moving towards a stationary observe with 34 m/sec speed. If the speed of sound is 340 m/sec, then the apparent frequency will be

• A. 410 cycles/sec
• B. 500 cycles/sec
• C. 550 cycles/sec
• D. 450 cycles/sec

Answer 1

The correct option is B 500 cycles/sec

Appearant frequency is given as;

$n^{\prime }=n\left(\frac{v}{v-v_0}\right)=450\left(\frac{340}{340-34}\right)=500$ cycles/sec