The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days?
\( \frac{1}{16} \)
\( \frac{1}{4} \)
\( \frac{1}{2} \)
\( \frac{15}{16} \)
Correct answer is D
No explanation has been provided for this answer.
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