Question

What effect occurs on the frequency of a pendulum if it is taken from the earth surface to deep into a mine

• A. Increases
• B. Decreases
• C. First increases then decrease
• D. None of these

Answer 1

The correct option is A Increases

In deep mine $g^{\prime }=g(1-\frac{d}{R})$,

i.e., $g$ decreases with depth.

so $n\propto \sqrt{g}$, frequency also decreases.