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13.Oscillations
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If the mass of the bob in a simple pendulum is increased to thrice its original mass and its length is made half its original length, then the new time period of oscillation is $\frac{x}{2}$ times its original time period. Then the value of $x$ is:
A
$\sqrt{2}$
B
$2 \sqrt{3}$
C
$4$
D
$\sqrt{3}$
(NEET-2024)
Solution
$T^{\prime}=2 \pi \sqrt{\frac{\ell^{\prime}}{g}} \text { where } \ell^{\prime}=\frac{\ell}{2}$
$T=2 \pi \sqrt{\frac{\ell}{g}}$
$T^{\prime}=\frac{x}{2} T$
$2 \pi \sqrt{\frac{\ell}{2 g}}=\frac{x}{2} 2 \pi \sqrt{\frac{\ell}{g}}$
$\frac{1}{\sqrt{2}}=\frac{x}{2} \Rightarrow x=\sqrt{2}$
Standard 11
Physics
