3. Which of the following is a periodic change?
(a) Beating of heart
(c) Storm
(b) Rainbow
(d) All of these
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d) all of these is your answer
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Periodic changes are changes which occur periodically or at regular intervals Example: Change of seasons. Day and night, changing phases of the moon, beating of heart, clock striking an hour are all examples of periodicmotion whereas waterbecoming ice, burning of matchstick etc are nonperiodic changes.
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