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Snowcat [4.5K]
3 years ago
6

Bismuth-212 has a half-life of 60.5 minutes. Find the amount of bismuth-212 left from a 100-gram sample after 242 minutes

Mathematics
1 answer:
amid [387]3 years ago
5 0

Notice that 242 = 4*60.5. This means after 242 minutes, the sample decays to \dfrac1{2^4}=\dfrac1{16} of its original amount. So you end up with

\dfrac{100\,\mathrm g}{16}=\boxed{6.25\,\mathrm g}

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