A radioactive substance has half-life T1/2 = 5 years — JEE Physics
A radioactive substance has half-life $T_{1/2} = 5$ years. Find the fraction of material remaining after 20 years.
1 Answer
VAVidaara Admin
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· 2mo ago
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Number of half-lives: $n = \dfrac{20}{5} = 4$
$$\frac{N}{N_0} = \left(\frac{1}{2}\right)^4 = \frac{1}{16}$$
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Discussion (2)
E
What changes if the medium/conditions were different?
KS
Brilliant explanation, the substitution step is what I kept missing.