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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

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Has to be reduced

Has to be increased

Needs no adjustment

Needs no adjustment but its mass has to be increased

answer is A.

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Detailed Solution

At the hill g will decrease. so, to keep the time period same, the length of pendulum has to be reduced

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