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A radioactive material has a half-life o...

A radioactive material has a half-life of 5 hours. In 20 hours 1g of material is reduced to ............. .

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`1/16g`[t=20h=4 half-lives, hence radioactive material remaining intact is `M=M_(0)[1/2]^(4)=M_(0)/16=1/16g`]
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