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
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B
Decreases
b (b) In deep mine $g' = g\,\left( {1 - \frac{d}{R}} \right)$; i.e., $g$ decreases so according to $n \propto \sqrt g ,$ frequency also decreases.
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