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Question

Half-life of a substance is 20 minutes. What is the time between 33% decay and 67% decay


A

40 min

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B

20 min

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C

30min

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D

25 min

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Solution

The correct option is B

20 min


t12=20 min(10033)=N02n1(10067)=N02n26733=2n2n12=2n2n1n2n1=1t2t1=t12


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