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(I) Define Resonant Vibrations. (II) Which Characteristic of Sound, Makes It Possible to Recognize a Person by His Voice Without Seeing Him? - Physics

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Short Note

(i) Define resonant vibrations. 
(ii) Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?

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Solution

(i) When the natural frequency of vibration becomes equal to the frequency with which the object is vibrating, the object will have maximum amplitude. This is called resonant vibration.
(ii) Timber or quality of sound.

Concept: Forced Vibrations
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