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 .... $(f)$
A$0.5$
B$1$
C$2$
D$4$
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C$2$
c (c) ${n_{{\rm{closed}}}} = \frac{v}{{4l}},{n_{{\rm{open}}}} = \frac{v}{{2l}}$
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