Question
What is resonance? Write condition for resonance.

Answer

Resonance : When the frequency of the applied periodic force is equal to the natural frequency of the body on which the force is applied such that the body readily takes up the vibrations and begins to vibrate with an increased amplitude, the phenomena is known as resonance.
Conditions for resonance : (i) The natural frequency of the given body must be equal to or an integral multiple of the frequency of the applied force (or vibrating body) (ii) The vibrating body must have sufficient force, so as to set the other body into vibrations

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