A simple pendulum is vibrating in an evacuated chamber. It will oscillate with
A simple pendulum is vibrating in an evacuated chamber. It will oscillate with
constant amplitude
decreasing amplitude
increasing amplitude
amplitude, the variation of which cannot be predicted
Solution
Since, the amplitude of simple pendulum depends on the net force acting on bob. As, in the vacuum, no external air dragging force acts on bob other than gravity.
That's why amplitude remains constant in vacuum.