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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 minutes
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B
20 minutes
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C
30 minutes
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D
25 minutes
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Solution

The correct option is B 20 minutes
Let N0 be the number of nuclei at beginning
Number of undecayed nuclei after 33% decay = 0.67N0
and number of undecayed nuclei after 67% of decay = 0.33N0
0.33N00.67N02 and in the half-life time the number of undecayed nuclei becomes half.

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