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Answer 1 · 2017-04-08T11:23:29

The ratio is $=2.45$

The period of a pendulum is

$T_e=2pisqrt(l/g_e)$

On the moon the period will be

$T_m=2pisqrt(l/g_m)$

The ratio will be

$T_m/(T_e)=sqrt(l/g_m)/sqrt(l/g_e)$

$=sqrt(g_e/g_m)$

$=sqrt(9.8/1.63)$

$=2.45$