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WAEC - Physics (1990 - No. 56)

A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?
1/32
1/16
1/8
1/4
1/2

Explication

1 → 1/2 → 1/4 → 1/8 → 1/16

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