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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 $\frac{A_{0}}{4}$ remains.

Fraction decayed = $A_{0} - \frac{A_{0}}{4}$

i.e. 3/4 of the original mass has decayed.

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