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Q.

The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40 % decay and 85% decay of the same radioactive substance is :

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a

45

b

60

c

15

d

30

answer is B.

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Detailed Solution

$decay 40 % \to 85 %$

Remaining $60 % \to 15 %$

$60 % \overset{t_{1 / 2}}{⟶} 30 % \overset{t_{1 / 2}}{⟶} 15 %$

$∴ t = 2 t_{1 / 2} = 60 \min$

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