define resonance briefly.
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Resonance
It is a special case of forced vibrations when the natural frequency of the external periodic force applied on the body is exactly equal to the frequency of the vibrating body.
A loud sound is heard when resonance occurs.
such vibrations are called resonant vibrations.
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The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system."
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