Question

A sound source is moving with speed 50 m//s towards a fixed observer. Frequency observed by observer is 1000Hz. Find out apparent frequency observed by observer when source is moving away from observer (Speed of sound =350 m//s)

Answer 1

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f

app

=(

V−50

v−0

)f

source

1000=(

300

350

)f

source

f

source

=

350

1000×300

f

app

=(

V+50

V

).f

source

=

400

350

×1000×

350

300

=750Hz

Answer 2

Answer:

f

app

=(

V−50

v−0

)f

source

1000=(

300

350

)f

source

f

source

=

350

1000×300

f

app

=(

V+50

V

).f

source

=

400

350

×1000×

350

300

=750Hz