State the reason for the type of vibrations in pendulums B ...

ICSE Class 10 Physics 2015 Solved Paper

In the diagram below, A,B,C,D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations.

Question : 52

Total: 74

State the reason for the type of vibrations in pendulums B and C.

Solution:

The pendulum C has its length same as that of A therefore its natural time period is also same that of A and both remain in same phase so resonance takes place. But B's length is lesser than the length of A hence B would vibrate with smaller amplitude.

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