Question

An engine, blowing a whistle of frequency 200Hz moves with a velocity
16ms–1 towards a hill from which a well defined echo is heard. Calculate the
frequency of the echo as heard by the driver. Velocity of sound in air is
340ms–1.

Answer 1

Answer:

the driver velocity of sounds in air 17 Ms

Answer 2

Dear Student,

◆ Answer -

f' = 220 Hz

● Explaination -

# Given -

f = 200 Hz

v = 340 m/s

v' = 16 m/s

# Solution -

Frequency of the echo heard by the driver is -

f' = f(v'+v)/(v'-v)

f' = 200 × (340 + 16) / (340 - 16)

f' = 220 Hz

Therefore, the frequency of the echo as heard by the driver is 220 Hz.

Thanks dear. Hope this helps you...