Question

Time period of a simple pendulum in a freely falling lift will be

• A. Finite
• B. Infinite
• C. Zero
• D. All of these

Answer 1

Answer: (B)

Infinite

we know, time period of a simple pendulum of length $\ell$,

is $T=2\pi \sqrt{\frac{l}{g_{\text{eff.}}}},$ where geff. is effective value of acceleration due to gravi'ty

of pendulum bob.

Here, $[\text{geff}=0]$ (since, lift is falling freely).

Th w, $T=\infty$ i.e time period in given condition is $Infinite.$

so, option (B) is correct.