Question

Consider that a source of sound vibrates with frequency 1700 Hz and a receiver are located on the same normal to the wall. With both source and receiver stationary, the wall recedes from the source with velocity 6 m/s.If the velocity of sound is 340m/s, the best frequency measured by the receiver will be

Answer 1

Here is the Doppler effect.

$$f=f_s\times V_{sound}/(V_{sound}+V)$$

$$f=1700\times 340/346=1671Hz$$

Answer: 1671Hz