ICSE Class 10 Physics 2015 Solved Paper

In the diagram below, $A, B, C, D$ are four pendulums suspended from the same elastic string $P Q$ . 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 of 74

Marks: +1, -0

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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