The fundamental note produced by a closed organ pipe is of frequency $f.$ The fundamental note produced by an open organ pipe of same length will be of frequency .... $(f)$
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(c) ${n_{{\rm{closed}}}} = \frac{v}{{4l}},{n_{{\rm{open}}}} = \frac{v}{{2l}}$
==> ${n_{{\rm{open}}}} = 2{n_{{\rm{closed}}}} = 2f$
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