SHM | Phase Difference

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Question 1. The phase difference between two pendulums at time t=0, t=15.5 sec and t=31 sec are approximately
A. pi, 2pi, zero
B. zero, pi, 2pi
C. zero, 2pi, pi
D. pi/2, 2pi/2, 5pi/2

Question 2. The difference in frequencies of the two pendulum is
A. zero
B. 0.032 Hz
C. 0.064 Hz
D. 0.016 Hz

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Thank a lot sir this thing helped me a lot ❤

HimanshuSharma-wphc