resonance question

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anonymouss2004
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I understand which answer A is correct, but can someone explained to me why B is wrong? I thought at resonance the path difference between driver and driven is pi. And also for C, is it that density of object does not affect how much it is damped?

Which one of the following statements concerning forced vibrations and resonance is
correct?
A An oscillating body that is not resonating will return to its natural frequency when the
forcing vibration is removed.
B At resonance, the displacement of the oscillating body is 180° out of phase with the forcing
vibration.
C A pendulum with a dense bob is more heavily damped than one with a less dense bob of the
same size.
D Resonance can only occur in mechanical systems
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Ethanity007
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At resonance, the driving force should be in phase with the driven system ie 0, 360…
180=> antiphase

For the same shape, it is harder to damp off the oscillation of a bigger mass (higher inertia).
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anonymouss2004
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(Original post by Ethanity007)
At resonance, the driving force should be in phase with the driven system ie 0, 360…
180=> antiphase

For the same shape, it is harder to damp off the oscillation of a bigger mass (higher inertia).
I see. Thank you!
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