A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?

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A. 1/32
B. 1/16
C. 1/8
D. 1/4
E. 1/2

Correct Answer:

Option B – 1/16

Explanation

1 → 1/2 → 1/4 → 1/8 → 1/16

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