Sunnkhueli5ceySz Sunnkhueli5ceySz

03-11-2016
Chemistry

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After three half-lives,what fraction of a radioactive sample remains.

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MartianManiac MartianManiac

14-11-2016

after1 half life 50 percent
after another half life 50 percent of 50 percent which is 25 percent
after 3 half lifes 50 percent of 50 percent of 50 percent which is 50 percent of 25 which is 12.5 percent
12.5 percent is left

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