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Which type of phenomenon can be used as ...

Which type of phenomenon can be used as a measure of time ? Given three examples.

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A phenomenon which repeats itself at regular
intervals can be used as a measure of time, for
example : (i) osciliations of a pendulum,
(ii) rotation of earth around its exis,
(iii) revolution of earth around it axis,
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PRADEEP-PHYSICAL WORLD AND MEASUREMENT-Conceptual Problem
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