The correct option is (a) greater.
<h3>What is simple pendulum?</h3>
A weight hanging from a pivot such that it may freely swing is called a pendulum. Gravity's restoring force will cause a pendulum to accelerate back toward its equilibrium position if it is sideways moved from its resting, equilibrium position.
The effective acceleration of the pendulum is equal to the sum of the acceleration caused by gravity and the elevator's upward acceleration while the elevator is moving upward.
T=2π√L/g(eff)
T=2π√L/(g+a)
Therefore, effective acceleration increases, and which results in a decrease in the period of motion.
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It is because earths mass is very large so its movement isnt noticibale
I wasn't there observing the experiment while you and your class
performed it, so I don't really know how it was set up, or what
happened.
But I can tell you this: Light doesn't bend while passing through
any medium. It only bends at the boundary where one medium
meets a different one.