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A train is moving with a uniform speed of 33 m/s and an observer is approaching the train with the same speed. If the train blows a whistle of frequency 1000 Hz and the velocity of sound is 333 m/s, then the apparent frequency of the sound that the observer hears is

A

1220 Hz

B

1099 Hz

C

1110 Hz

D

1200 Hz

Text Solution

Verified by Experts

The correct Answer is:
A
According to Doppler.s effect of sound, apparent frequency heard by observer.
`u =((v+v_(0))/(v-v_(0)))v_(0)`
Here, `v_(0) = 1000 Hz, v_(0) = v_(s) = 33 ms^(-1)`
`v = 333 ms^(-1), v=?`
`v=((333 + 33)/(333-33)) xx 1000 = 366/300 xx 1000 = 1200` Hz
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