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Two air columns (closed at one end) 100 ...

Two air columns (closed at one end) 100 cm and 101 cm long give 17 beats in 20s, when each is sounding its fundamental note. The velocity of sound is :

A

`34340 cm//s`

B

`30340 cm//s`

C

`33240 cm//s`

D

`32000 cm//s`

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