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After three half lifes, the fraction of a radioactive mat...

After three half lifes, the fraction of a radioactive material that has decayed is

A.

$\frac{1}{8}$

B.

$\frac{1}{3}$

C.

$\frac{2}{3}$

D.

$\frac{7}{8}$

View answer & explanation

Correct answer is D

I = $\frac{1}{2}$ $\Rightarrow$ $\frac{1}{4}$ $\Rightarrow$ $\frac{1}{8}$

Fraction decayed = 1 - $\frac{1}{8}$

= $\frac{7}{8}$

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