Question

Mention some repetitive phenomenon in nature which could source as time standards . Which one is most suitable​

Answer 1

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time standard are

• (A)the rotation of earth around the sun
• (B)the rotation of earth around its own axis.
• (C)oscillation of pendulum.
• (D) human pluses rate
• (E) half life of a radioactive element.
• (F)Vibration of Atom

Now, we are shifting to vibration of atoms as the most suitable repetitive phenomenon..

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