Assertion : If a pendulum falls freely, then its time period becomes infinite.
Reason : Free falling body has acceleration, equal to 'g'.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false

Answer

A

Explanation

If a pendulum is suspended in a lift and lift is moving downward with some acceleration a, then time period of pendulum is given by, `T=2pisqrt(l/(g-a))`
In the case of free fall, a=g = then T=`oo`
i.e., the time period of pendulum becomes infinite.