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Assume that the rate at which radioactiv...

Assume that the rate at which radioactive nuclei decay is proportioanl to the number of such nuclei that are present in a given sample. In a certain sample `10%` of the original number of radioactive nuclei have undergone disintegration in a period of 100 years. What percentage of the original radioactive nuclei will remain after 1000 years.?

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The correct Answer is:
(a) `(9^(10))/(10^(8))% " " (b) 133 1/3 ` gms.
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