Question

A policeman blows a whistle of frequency 300hz as a car speed past him with a velocity of 36kmhr find the change in the frequency as heard by the driver of the car just as he passes the police man velocity of sound 345ms

Answer 1

Dear Student,

◆ Answer -

∆f = 8.7 Hz

● Explanation -

# Given -

f = 300 Hz

vs = 345 m/s

vc = 36 km/hr = 10 m/s

# Solution -

Frequency of sound heard by the driver of the car is -

f' = f × (v+vs)/vs

f' = 300 × (10+345)/345

f' = 308.7 Hz

Change in frequency as heard by the driver is -

∆f = f' - f

∆f = 308.7 - 300

∆f = 8.7 Hz

Hope this helps you...

Answer 2

Answer:

f=300 hertz

fc= 36 km hr

= 10 ms

fs=v+vs/vs

fs= 308.7

f= 308.7-300

f=8.7

Explanation:

hope it helps you