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Time period of a simple pendulum is 2sec. If its length is increased by 4 times, then its period becomes ___________

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Time period of a simple pendulum is 2sec. If its length is increased by 4 times, then its period becomes ___________

(a) 8 sec

(b) 12 sec

(c) 16 sec

(d) 4 sec

This question was addressed to me during an interview.

Question is from Wave Motion in chapter Waves of Engineering Physics I

1 Answer

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Best answer
Right choice is (d) 4 sec

Easiest explanation: T^‘/T=√(l^‘/l)=√(4l/l)=2

T^‘=2T=2×2=4sec.

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