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Q.

It 20 g of a radioactive substance due to radioactive decay reduces to 10 g in 4 minutes, then in what time (in minutes) 80 g of the same substance will reduce to 20 g

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answer is 8.

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Detailed Solution

N=N012n 20=8012n⇒ 12n=122⇒ n=2⇒ t=nT12=2×4=8 minutes
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