If pendulum P is set into oscillations, only pendulum B will oscillate with large amplitude, this is the case of
A
Beats
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B
Standing waves
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C
Resonance
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D
Doppler's effect
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Solution
The correct option is C Resonance As, the lengths of pendulum P and B are same, their natural frequencies are equal. So resonance will happen, and the amplitude of pendulum will increase.