Physics
The velocity of heat radiation in vacuum is

Greater than that of light
Equal to that of sound
Less than that of light
Equal to that of light

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

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

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