Physics
The alluminating powers of two sources are compared by

A spectrometer
A polarimeter
A fluxmeter
A photometer

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

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

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