If the length of a pendulum is made 9 times and mass of the bob is ...

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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
[BHU 2005]
(a) \( 3 T \)
(b) \( 3 / 2 T \)
\( \mathrm{P} \)
(c) \( 4 T \)
(d) \( 2 T \)
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