Answer:
Some
of the repetitive phenomena occurring in nature are :
(i) Regular
heart beat of a person,
(ii)
Oscillations of a simple pendulum,
(iii)
Vibration of atoms,
(iv)
Rotation of earth about its axis,
Earlier,
rotation of earth about its axis could be taken as most appropriate. Now, we
are shifting to vibration of atoms as the most suitable repetitive phenomenon.
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