1
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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If $${N_0}$$ is the original mass of the substance of half-life period $${t_{1/2}} = 5$$ years, then the amount of substance left after $$15$$ years is
A
$${N_0}/8$$
B
$${N_0}/16$$
C
$${N_0}/2$$
D
$${N_0}/4$$
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