positive ray

positive ray

 
noun Physics.
a stream of positive ions traveling from a metallic anode to the cathode in a gas-discharge tube.
Also called anode ray, canal ray.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Positive ray is always a great word to know.
So is half-life. Does it mean:
the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum
the time required for one half the atoms of a given amount of a radioactive substance to disintegrate
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