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A radioactive substance disintegrates at...

A radioactive substance disintegrates at as rate proportional to the amount of substance present. If 50% f the given amount disintegrates in 1600 years. What percentage of the substance disintegrates i 10 years ? `(-log2)/(160)T a k ee=0. 9957`

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The correct Answer is:
`0*43%` of the original amount of substance.
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