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A train is moving with a uniform speed o...

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

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