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MHT CET Physics question

PhysicsOscillationsMHT CET

Two pendulums of time period 3 and 7 respectively start oscillating simultaneously from two extreme positions. After how much time will they be back in the same phase?

Answer: (B)

Solution

Starting from opposite extremes the phase difference is initially ; they are in the same phase when \frac\frac$

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Question ID VK-068200