If the length of a pendulum is made $9$ times and mass of the bob is made $4$ times then the value of time period becomes
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(a) $T = 2\pi \sqrt {\frac{l}{g}} $
==> $T \propto \sqrt l ,$
hence if l made $9$ times $T$ becomes $3$ times.
Also time period of simple pendulum does not depends on the mass of the bob.
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