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Q.

If the period of oscillation changes from 2 sec  to 1.5 sec, and the initial length of simple pendulum is 1m, then the change in length is

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a

decreased by716m

b

increased by916m

c

decreased by916m

d

Increased by716m

answer is B.

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Detailed Solution

detailed_solution_thumbnail

T1T2=ℓ1ℓ2=21.5=ℓ1ℓ2;ℓ2=916m ℓ1=1m Δℓ1=ℓ2−ℓ1=916−1=−716m
So, decreases by716m  ℓ2<ℓ1

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