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Two pendulums C and D are suspended from...

Two pendulums C and D are suspended from a wire as shown in the figure given below. Pendulum C is made to oscillate by displacing it from its mean position. It is seen that D also starts oscillating.
What is the name of the phenomenon when the length of D is made equal to C ?

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The phenomenon is called resonance.
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ICSE-QUESTION PAPER-2019-SECTION-II
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