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Byju's Answer
Standard XII
Chemistry
Equivalent, Molar Conductivity and Cell Constant
After two hal...
Question
After two half lives, what fraction of a radioactive sample has decayed?
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Solution
Well, 3/4th of the original isotope has decayed.
Explanation:
After 1 half-life, clearly HALF of the original isotope remains.
And after TWO half-lives, a
A
0
4
remains.
Fraction decayed =
A
0
−
A
0
4
i.e. 3/4 of the original mass has decayed.
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