Physics
Which type of reaction produces the most harmful radiation ?

Chemical reaction
Fission reaction
Photo-Chemical reaction
Fusion reaction

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Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the 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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Physics
A standing wave occurs when

A wave reflects upon itself
The speed of the wave is zero or near zero
Two waves overlap
The amplitude of a wave exceeds its wavelength

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