Physics
Which of the following is an example of simple harmonic motion?

Earth spinning on its axis
Motion of a ceiling fan
Ball bouncing on floor
Simple pendulum motion

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Physics
Radiocarbon is produced in the atmosphere as a result of

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Lightning discharge in atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

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