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12 June, 22:52

Uranium 235 has a half life of 700 million years. how long does it take a 100 gram sample of uranium 235 to decay a mass of 50 grams

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  1. 13 June, 00:10
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    The half-life is the time needed for 1/2 of a sample to decay.

    50 g is 1/2 of 100 g, so the time needed is ... one half-life.
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