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Resonance refers to an effect in which the

Awhole instrument vibrates on its natural or fundamental frequency
Bintensity of a sound decreases over time
Cpitch of a note is compared to a pure tone
Dpitch changes when two waves with similar frequencies interfere with each other

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WorldlyGlass49

The correct answer is a. whole instrument vibrates on its natural or fundamental frequency

Resonance is a process in which a certain instrument vibrates due to force from another vibrating system being applied to it. An example of this would be a woodwind instrument that vibrates when you blow into it, with a blow being a force of another vibrating system that is your lungs.

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