Question: Q. 4. Define ionization energy.
How would the ionization energy change when electron in hydrogen atom is replaced by the particle of mass 200 times that of the electron but having the same charge? [Given Rydberg constant, $\left.R=10^{7} \mathrm{~m}^{-1}\right]$
R [Delhi I 2016]
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Solution:
Ans. The minimum energy, required to free the electron from the ground state of the hydrogen atom, is known as ionization energy.
$$ E_{0}=\frac{m e^{4}}{8 \varepsilon_{0}^{2} h^{2}} \text { i.e., } E_{0} \propto m $$
Therefore, ionization Energy will become 200 times.
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[CBSE Marking Scheme 2016]
