Physics
The width of depletion layer of a P-N junction

Decreases with light doping
Is independent of applied voltage
Increases with heavy doping
Is increased under reverse bias

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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
Skating on ice is possible because

The surface of ice is smooth
The pressure on the ice due to skate raises its melting point
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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