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A source is moving towards an observer with a speed of 20 m / s and having frequency of 240 Hz . The observer is now moving towards the source with a speed of 20 m / s . Apparent frequency heard by observer, if velocity of sound is 340 m / s , is

A

240 Hz

B

270 Hs

C

280 Hz

D

360 Hz

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The correct Answer is:
B
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