C cathode rays cause fluorescence
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cathode rays
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X-Rays: The Discovery that Revolutionized Science (1895)
76% Informative
In 1895 at Wurzburg , Wilhelm Rundkin conducted a series of experiments on the effect of cathode rays on certain crystals.
In Paris , Henri Becquerel started with the known phenomenon that certain chemical substances became fluorescent after being exposed to sunlight.
Marie Curie , a young Polish chemist, decided to investigate the phenomenon further and began a systematic search for other minerals which would give off these rays.
She was, in fact, looking for what we now know as radioactive elements.
The half life is the length of time taken for a given amount of substance to lose half its radioactivity.
For example, the radioactive atoms of a gram of thorium decay by half in 10 seconds .
After a further 10 seconds , half of the remaining radioactive atoms decay.
The discovery of radioactivity led to a new conception of the structure of the atom.
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