alleryTwo simple pendulums of lengths 1 m and 4 m start swinging in phase. They will be in phase again after:
AT2 (period of longer)
BLCM of T1 and T2
CT1 (period of shorter)
DNever
Answer & Solution
Correct answer: B. LCM of T1 and T2
T1 = 2π√(1/g) and T2 = 2π√(4/g) = 2T1. Pendulums in phase when both complete integer cycles.
Smallest such time is LCM(T1, T2) = 2T1 = T2. So after T2.
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