1
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive substance is $$20$$ minutes. The approximate time interval $$\left( {{t_2} - {t_1}} \right)$$ between the time $${{t_2}}$$ when $${2 \over 3}$$ of it had decayed and time $${{t_1}}$$ when $${1 \over 3}$$ of it had decayed is :
A
$$14$$ min
B
$$20$$ min
C
$$28$$ min
D
$$7$$ min
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