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Atomic Structure - Result Question 11
11. The increasing order (lowest first) for the values of $e / m$ (charge/mass) for electron $(e)$, proton $(p)$, neutron $(n)$ and alpha particle $(\alpha)$ is
$(1984,1 M)$
(a) $e, p, n, \alpha$
(b) $n, p, e, \alpha$
(c) $n, p, \alpha, e$
(d) $n, \alpha, p, e$
Show Answer
Answer:
Correct Answer: 11. (d)
Solution:
- Neutron has no charge, hence $e / m$ is zero for neutron. Next, $\alpha$-particle $\left(He^{2+}\right)$ has very high mass compared to proton and electron, therefore very small $e / m$ ratio. Proton and electron have same charge (magnitude) but former is heavier, hence has smaller value of $e / m$.
$\dfrac{e}{m} : n< \alpha < p < e $
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