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A pendulum clock is set to give correct ...

A pendulum clock is set to give correct time at the sea level. This clock is moved to hill station at an altitude of 2500 m above the sea level. In order to keep correct time of the hill station, the length of the pendulum

A

Has to be reduced

B

Has to be increased

C

Needs no adjustment

D

Needs no adjustment but its mass has to be increased

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The correct Answer is:
A
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