Physics
Who indirectly determined the mass of the electron by measuring the charge of the electron?

Thomson
Millikan
Rutherford
Einstein

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

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

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