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A sources of sound is at one end of hall...

A sources of sound is at one end of hallow tube. An observer at other end hears two distinct notes aftea time interval of 1s.If velocity of sound in air is 340 m/s and in metal is 3740 m/s , then lengths of pipe is

A

374 m

B

324 m

C

340 m

D

347 m

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The correct Answer is:
A
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