An organ pipe ${P_1}$ closed at one end vibrating in its first overtone and another pipe ${P_2}$ open at both ends vibrating in its third overtone are in resonance with a given tuning fork. The ratio of lengths of ${P_1}$ and ${P_2}$ is
A$1:2$
B$1:3$
C$3:8$
D$3:4$
Medium
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C$3:8$
c (c) First overtone of closed organ pipe ${n_1} = \frac{{3v}}{{4{l_1}}}$
Third overtone of open organ pipe ${n_2} = \frac{{4v}}{{2{L_2}}}$
${n_1} = {n_2}$ (Given)
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