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Atoms — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAtoms2 Marks
Question
Define ionisation energy. How would the ionsation energy change when electron in hydrogen atom is replaced by a particle of mass 200 times that of the electron but having the same charge?
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Answer

The minimum energy, required to free the electron from the ground state of the hydrogen atom, is known as Ionization Energy.
$\text{E}_{k} = \frac{\text{me}^{4}}{8\in_{o}^{2}\text{h}^{2}}\text{i.e,.}\text{E}_{o}\propto\text{m}$
Therefore, Ionization Energy will become 200 times.

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