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The frequency of the first overtone of a...

The frequency of the first overtone of a closed pipe of length `l_(1)` is equal to that of the first overtone of an open pipe of length `l_(2)`. The ratio of their lengths `(l_(1):l_(2)` is

A

`2:3`

B

`4:5`

C

`3:5`

D

`3:4`

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