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Question
What percentage of radioactive substance is left after five half-lives?
Options
20 %
About 97 %
About 3 %
5 %
MCQ
Fill in the Blanks
Solution
About 3 %
Explanation:
`"N"_0/"N" = 2^5`
`therefore "N"/"N"_0 = 1/2^5`
`therefore "N"/"N"_0 xx 100 = 100/32 = 3.125`%
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