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7 August, 11:12

A radioactive kind of nitrogen has a half-life of 10 minutes. If you start with 64 grams of the substance, how much will be left after 20 minutes

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  1. 7 August, 12:49
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    There would be 16 grams left after 20 minutes.

    64/2 = after ten minutes

    = 32

    32/2 = after another ten minutes (20 full)

    = 16
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