If a tuning fork starts to vibrate when a certain note is played on the piano. This is an example of: A. resonance.
Resonance is one of the notable properties of sound waves and it can be defined as a phenomenon in which an object such as a turning fork is forced to vibrate as a result of the vibration of a second object (piano) at the same natural frequency of the first object. Thus, the tuning fork begins to vibrate when a certain note (the same natural frequency of the fork) is played on the piano.
In this context, the frequency of note played on the piano matches the natural frequency of a turning fork, thereby causing it to vibrate.
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