If fundamental frequency of closed pipe is $50\,Hz$ then frequency of $2^{nd}$ overtone is .... $Hz$
A$100$
B$50$
C$250 $
D$150$
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C$250 $
c (c) Frequency of ${2^{nd}}$ overtone ${n_3} = 5{n_1} = 5 \times 50 = 250\,Hz$.
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