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15 May, 07:50

The half-life of a radioactive kind of radium is 11 days. How much will be left after 22 days, if you start with 64 grams of it?

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  1. 15 May, 07:57
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    Half - life means after the half life period, only half the original amount remains.

    So after 11 days half of 64 grams remain: 64 / 2 = 32 grams,

    The after another 11 days, which would be 22 days total (11x 2=22) only 32/2 = 16 grams would remain.
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