Question

difine and explain resonance

Answer 1

Hope this helps you:-

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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Answer 2

the quality in a sign of being deep full and reverberating.
the reinforcement on pollination of Sound By reflection from a surface or by the scynchronous vibration of any neighboring object