Physics
What is the principle of a ''Life Jacket"?

It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person
The person can sit on it like a raft
It increases the volume of the person to keep him afloat

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Physics
A white and smooth surface is

Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat
Good absorber and good reflector of heat

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