Text: "The driving of a mechanical or acoustical system at its resonant frequency by energy from an adjacent system vibrating at this same frequency. Increasing the dampening of a vibrating system will decrease the amplitude of its sympathetic vibration but at the same time widen the band of frequencies over which it will partake of sympathetic vibrations." McGraw-Hill Dictionary of Science & Technical Terms 3rd ed.

See Also: RESONANT FREQUENCY

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