3. What is resonance?
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Resonance describes the phenomenon of increased amplitude that occurs when the frequency of a periodically applied force (or a Fourier component of it) is equal or close to a natural frequency of the system on which it acts.
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When the frequency of externally applied periodic force on a body is equal to its natural frequency ,the body readily begins to vibrate with an increased amplitude .This phenomenon is known as Resonance.
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