Question

A simple pendulum suspended from the roof of a lift oscillates with frequency u when the lift is at rest. If the lift falls freely under gravity, its frequency of oscillation becomes

• A. Zero
• B.
• C. 2
• D. Infinite

Answer 1

Answer: (A)

Zero

Answer 2

When the lift is at rest the frequency of oscillation of simple pendulum is

When the lift falls freely then effective value of acceleration due to gravity is

$\therefore v = 2 \pi \sqrt { \frac { 0 } { \mathrm {~L} } } = 0$