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The number of unstable nuclei remaining after a time t 5.00 yr is N, and the...

The number of unstable nuclei remaining after a time t 5.00 yr is N, and the number present initially is N0. Find the ratio N/N0 for (a) (half-life 5730 yr), (b) (half-life 122.2 s; use t 1.00 h, since otherwise the answer is out of the range of your calculator), and (c) (half-life 12.33 yr).

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Answer #1

N/N0 = e^(-lambda*t)

lambda= ln2/halflife

so you can calculate now

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