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Two open organ pipes of fundamental ...

Two open organ pipes of fundamental frequency ` n _(1) and n_(2) ` are joined in series . The fundamental frequency of the new pipe so obtained will be

A

`( n_(1) + n_(2))`

B

` ( n_(1)+ n_(2))/(( 2) `

C

`sqrt( n _(1) ^(2) + n _(2)^(2))`

D

` ( n _(1) n_(2))/( n_(1) +n_(2))`

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