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7.Gravitation
easy
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 increasedNeeds no adjustment
C
Needs no adjustment but its mass has to be increased
D
Needs no adjustment but its mass has to be increased
Solution
(a) $T = 2\pi \sqrt {\frac{l}{g}} $. At the hill $g$ will decrease so to keep the time period same the length of pendulum has to be reduced.
Standard 11
Physics
