Half-life.

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Presentation transcript:

Half-life

Half-life The time it takes for one half of a sample to undergo radioactive decay Half-lives vary in length depending on the isotope

If you know how to use the formula, you may Half-life Problems Formula: A=A₀∙2-t/h A= final amount A₀= initial amount t= time h= half-life If you know how to use the formula, you may

Half-life Problems Assuming you have 100% of a sample this is the % left after each half-life.

If you have a 200g sample of a radioisotope which has a half-life of 30 years, how much will remain after 150 years?

What is the half-life of an unknown material if 0 What is the half-life of an unknown material if 0.195% remains after 2304 years?

If you have a 200g of a radioisotope left after 40years, how much did you start with if the half- life of the isotope is 10 years?

If you have a sample of a radioisotope that has a half-life of 15 years, how many years will have passed when 6.25% remains?

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