MCQ
Values of $\frac{e}{m}\left[\frac{\text { charge }}{\text { mass }}\right]$ in the categories alpha particle $(\alpha)$, electron (e) and protons (p) increase in the order:
- A$p < e <\alpha$
- ✓$\alpha< p < e$
- C$e <\alpha< p$
- D$\alpha< e < p$
✓
Answer
Correct option: B.
$\alpha< p < e$
(b) $\alpha<$ p $<$ e
Explanation: $\alpha$-particle $\left( He ^{2+}\right)$ has a very high mass compared to proton and electron, therefore a very small $\frac{e}{m}$ ratio. Proton and electron have the same charge (magnitude) but former is heavier, hence has a smaller value of $\frac{e}{m}$.
Explanation: $\alpha$-particle $\left( He ^{2+}\right)$ has a very high mass compared to proton and electron, therefore a very small $\frac{e}{m}$ ratio. Proton and electron have the same charge (magnitude) but former is heavier, hence has a smaller value of $\frac{e}{m}$.
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