Question

Calculate the percentage of the original nuclei of a sample of radioactive substance left after five halflife

Answer 1

3.125% will be left of original nuclei of radioactive substance after 5 half-lives

Explanation:

Half life is a period after which a radioactive substance decays half of its total amount.

Amount after first half-life = 100/2 = 50%

Amount after second half-life = 50/2 = 25%

Amount after third half-life = 25/2 = 12.5%

Amount after forth half-life = 12.5/2 = 6.25%

Amount after fifth half-life = 6.25/2 = 3.125%