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Question

A simple pendulum has a time period T1 when on the earth's surface and T2 when taken to a height R above the earth's surface, where R is the radius of the earth. The value of T2/T1 is :

A
1
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B
2
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C
4
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D
2
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Solution

The correct option is D 2
If acceleration due to gravity is g at the surface of earth, then at height R, it's value becomes g=g(RR+h)2=g(RR+R)2=g4
T1=2πlg and T2=2πlg/4
T2T1=2

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