Question

There is a simple pendulum hanging from the ceiling of a lift. When the lift is standstill, the time period of the pendulum is T. If the resultant acceleration becomes g/4, then the new time period of the pendulum is?

(a) 0.8T

(b) 0.25T

(c) 2T

(d) 4T

Answer 1

Correct choice is (c) 2T

To explain: T=2×√(l/g)

T^‘=2π×√((l/g)/4)

T^‘=2T.