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7 May, 21:48

The half life of a certain substance is 28 years. how long will it take for a sample of this substance to decay to 78% of its orginal amount.

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  1. 7 May, 21:59
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    The life = 28*2 = 56

    100% - 78%=22%

    56*22/100 = 12,32 years to decay 22% of it s original amount / and there remains 78 % of the original amount.
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