Question

When two objects vibrate at the resonance frequency, the first object increases the ______ of the vibrations of the second object.

• A. amplitude
• B. wavelength
• C. frequency
• D. speed
• E. period

Answer 1

The correct option is A amplitude

The vibrating objects' motion could be compared to that of longitudinal waves. The resonant waves would add the amplitude of themselves to produce a wave of larger amplitude.

Hence overall the amplitude of vibration of the second object increases due to resonance with the first.