Answer :
Final answer:
The amplitude becomes maximal when the input frequency matches the resonator's natural frequency, a phenomenon known as resonance.
Explanation:
The amplitude of a resonator becomes maximal when the input frequency from the generator matches the resonator's natural frequency, not when it is higher or lower. This is known as resonance, which occurs when the driving frequency equals the natural frequency of the oscillator. At resonance, the oscillator responds with the greatest amplitude, resulting in the maximum response.
For example, tuning a radio involves adjusting the resonant frequency so that it matches the desired station's broadcast frequency. Another example is a child on a swing being pushed at the swing's natural frequency, resulting in maximum height. In both cases, energy transfer from the driving force into the oscillator is most efficient at resonance.
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