One of the many by products of uranium is radioactive plutonium, which has a half life of approximatley 25000 ytears. if some of this putonium is encased in concrete, what fraction of it will remain after 100 years?

0.9972 fraction of plutonium will remain after 100 years.

Explanation:

Half life of plutonium =

Let the initial mass of plutonium be =

Mass of plutonium after time of 100 years = A

Decay constant for this process =

0.9972 × 100 = 99.72 %

0.9972 fraction of plutonium will remain after 100 years.

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