Question:
The half-life of tritium is 12.5 years. What mass of tritium of initial mass 64 mg will remain undecayed after 50 years ?
The half-life of tritium is 12.5 years. What mass of tritium of initial mass 64 mg will remain undecayed after 50 years ?
Updated On: Jan 22, 2025
- 32 mg
- 8 mg
- 16 mg
- 4 mg
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The Correct Option is D
Solution and Explanation
$m =\frac{ m _{0}}{2^{ n }}$
$t = nT$
$50= n \times 1.25$
$ \Rightarrow n =4$
$\therefore m =\frac{ m _{0}}{2^{4}}$
$=\frac{64}{16}$
$=4 \, mg$
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Concepts Used:
Half-life
The amount of time taken for half of a particular sample to react is known as Half-life.
Half-Life Formula:
We can describe exponential decay by any of the three formulas
