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Consumer Electronics by S. P. Bali

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RESONANCE

The best way to set a child's swing in motion is to give it small pushes in time with the natural period of the swing. This is an example of a general principal in physics called resonance.

Resonance is said to occur whenever a particular body or system is set into oscillation at its own natural frequency as a result of impulses received from some other system which is vibrating with the same frequency.

 

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Fig. 1.23 Effect of the frequency of the forced vibration on amplitude

 

Under these conditions it is possible for a very large amplitude of vibrations to be set up.

We find applications of the same principle in other branches of ...

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