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9 July, 09:26

The half-life of a radioactive kind of tellurium is 40 minutes. How much will be left after 240 minutes if we started with 576 grams of it?

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  1. 9 July, 11:08
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    That is probably tellurium 134 which has a half-life of 41.8 minutes but we'll stick with the 40 minutes you stated.

    240 / 40 minutes equals precisely 6 half-lives.

    Every half-life reduces a radioactive substance by one half.

    So 6 half-lives reduces it by 1 / (2^6) which equals 0.015625

    576 *.015625 = 9 grams exactly.
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