If a 20 gram sample of a radioactive substance has a half-life of 6000 years, how many grams would be present after 18000 years?

1 answer

Radioactive decay law
N =N₀exp(-λt)=
=N₀exp(-ln2•t/T)=
=20exp(-0.693•18000/6000) = 2.5 g
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