7(iii)
We are able to see the T.V. channels clearly when we set T.V. on auto-tuning.
(a) Which phenomenon led to the clear visibility of the channels, due to auto tuning?
(b) Define the above phenomenon mentioned by you.
(c) Give any one more example of this phenomenon.
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(a) Resonance.
(b) When the frequency of the 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.
(c) Air in sound box vibrates with higher amplitude due to vibrating string of musical instruments. This is an example of resonance.