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16 December, 01:43

What is the radioactivity of the sample of sodium - 24 after 30h?

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  1. 16 December, 02:00
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    Half life is 15 hours

    so 30 hours would be 2 half lives

    after 15 hours it would be at 50%

    after 15 more hours it would be at 50% of 50%

    so. 5 x. 5 =.25

    it would be 25%
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