Two pendulums begin to swing simultaneously. If the ratio of the frequency of oscillations of the two is $7 : 8$, then the ratio of lengths of the two pendulums will be
A$7:8$
B$8:7$
C$49 : 64$
D$64:49$
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D$64:49$
d (d) Suppose at $t = 0$, pendulums begins to swing simultaneously.
Hence, they will again swing simultaneously
if ${n_1}{T_1} = {n_2}{T_2}$
$ \Rightarrow \frac{{{n_1}}}{{{n_2}}} = \frac{{{T_2}}}{{{T_1}}} = \sqrt {\frac{{{l_2}}}{{{l_1}}}}$
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