An observer is moving with a velocity of 100m/s towards a stationary sound source .The observer measures the frequency of the source as 1000Hz.What will be the frequency of sound measured by observer ,when he is moving away from the source after crossing it?(Take velocity of sound in air is 350m/s)
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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
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