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JEE Main 2002 (AIEEE) · Law of Radioactive Decay

Law of Radioactive Decay question from JEE Main 2002 (AIEEE)

Q116JEE Main 2002 · AIEEEEasy

Law of Radioactive Decay

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

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Answer: (a)

$n = \frac{15}{5} = 3$ half-lives.
Amount left $= \frac{N_0}{2^3} = \frac{N_0}{8}$ .
So the answer is (a) $N_0/8$ .

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