4) What is meant by vibration ?
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víвrαtíσn, pєríσdíc вαck-αnd-fσrth mσtíσn σf thє pαrtíclєs σf αn єlαstíc вσdч σr mєdíum, cσmmσnlч rєsultíng whєn αlmσst αnч phчsícαl sчstєm ís dísplαcєd frσm íts єquílíвríum cσndítíσn αnd αllσwєd tσ rєspσnd tσ thє fσrcєs thαt tєnd tσ rєstσrє єquílíвríum. ..
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Vibration means quickly moving back and forth (or up and down) about a point of equilibrium. ... Something that is vibrating may shake at the same time. If it vibrates in a regular way, it may produce a musical note because it can make the air vibrate.
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