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Question

A simple pendulum (whose length is less than that of a second's pendulum) and a second's pendulum starts swinging in phase. They again swing in phase after an interval of 18 second from the start. The period of the simple pendulum is
  1. 0.9 sec
  2. 1.8 sec
  3. 2.7 sec
  4. 3.6 sec

A
1.8 sec
B
3.6 sec
C
0.9 sec
D
2.7 sec
Solution
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