Physics
Tungsten is used for the manufacture of the filament of an electric bulb, because

It has a very high melting point
It is economical
It is a good conductor
It is malleable

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Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
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.

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Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing
Two waves of same frequency travelling in the same direction

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