If of a radioactive substance has a half-life of , a separate sample of the identically same substan — Nuclear Chemistry and Radioactivity Chemistry Question
Question
If $5\text{ g}$ of a radioactive substance has a half-life of $14\text{ hours}$, a separate $20\text{ g}$ sample of the identically same substance will have a half-life of:
Answer: B
💡 Solution & Explanation
Radioactive decay follows first-order kinetics. The half-life ($T_{1/2} = 0.693 / \lambda$) is entirely independent of the initial amount or concentration of the radioactive substance. Therefore, the half-life remains $14\text{ hours}$.
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