Question

A bat, flying at 7.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)

Answer 1

Answer:

Explanation:

Given

Velocity of bat $v_o=7\ m/s$

Frequency of sound $f=50\ kHz$

velocity of sound $v=340\ m/s$

using Doppler Effect apparent frequency is given by

$f'=f\cdot \frac{v-v_o}{v+v_s}$

where  

$f'=$apparent frequency  

v=velocity of sound in the given media

$v_s=$velocity of source

$v_o=$velocity of observer      

here velocity of source is zero

as source is travelling towards source thus

$f'=50\cdot (\frac{340+7}{340})$

$f'=51.029\ Hz$