What percentage of a sample original radioactive remains after 5 half-lives?

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03-12-2017
Chemistry

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What percentage of a sample original radioactive remains after 5 half-lives?

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Kalahira Kalahira · Answer 1 · 2017-12-15T21:21:36+01:00

Kalahira Kalahira

15-12-2017

3.125% If at first there is 100 atoms after 1 half lives there is 100/2=50 atoms after 2 half lives there is 50/2=25 atoms after 3 half lives there is 25/2=12.5 atoms after 4 half lives there is 12.5/2=6.25 atoms after 5 half lives there is 6.25/2=3.125 atoms So there is 3.125% after 5 half lives.

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amescher557 amescher557 · Answer 2 · 2022-04-08T15:31:11+02:00

amescher557 amescher557

08-04-2022

Answer:

3.125%

Explanation:

it is (.5)^5=.03125=3.125%

If it was four half-lives, it would be (.5)^4 ect

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