Question

A second's pendulum is kept in a satellite revolving at a height $3R_E$ from earth's surface. Its time period will be:

• A. $2\sqrt{3}s$
• B. 1 s
• C. zero
• D. Infinity

Answer 1

The correct option is D Infinity

The time period is given by
$T=2\pi \sqrt{\frac{l}{g}}$
Since there is no gravity at height $3R$ from earth's surface, $g=0$ and hence time period is infinity.