What would be the length of a sec. A pendulum at a planet (where acc, due to gravity is g/4) if it's length on earth is l
A
l/2
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B
2l
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C
l/4
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D
4l
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Solution
The correct option is Bl/4 Since T (time period) =2p√lg for seconds pendulum T=2sec Now on the planet the value of acceleration due to gravity is g/4 So for the planet, the length of seconds pendulum l′ is 2sec2sec=√1g×g/4l′⇒l′=l/4