Find the fundamental frequency of a closed pipe, if the length of the air column is $42 m$. (speed of sound in air $= 332 \,m/sec$) .... $Hz$
A$2$
B$4$
C$7 $
D$9$
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A$2$
a (a) For closed pipe $n = \frac{v}{{4l}}$$ \Rightarrow $$n = \frac{{332}}{{4 \times 42}} = 2\,Hz$.
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