Question 1: Atoms & Nuclei

Question

15 eV is given to electron in 4th orbit then
find its final energy when it comes out of
H-atom.

Accepted Answer

Given, total energy given to $$e^{-}$$ in 4th orbit, $$E=15 \mathrm{~eV}$$
Energy of $$n$$th orbit of $$\mathrm{H}$$-atom, $$E^{\prime}=-\frac{13.6}{n^2}$$
So, energy of 4th orbit of $$\mathrm{H}$$-atom, $$E^{\prime}$$
$$=\frac{-13.6}{4^2}=-0.85 \mathrm{~eV}$$
$$	herefore$$ Ionisation energy of 4th orbit $$=-E^{\prime}$$
$$=-(-0.85 \mathrm{eV})=0.85 \mathrm{~eV}$$
$$	herefore$$ Final energy of electron, when it comes out of $$\mathrm{H}$$-atom.
$$E=$$ Total energy given to electron - Ionisation energy of 4th orbit
$$=15-0.85=14.15 \mathrm{~eV}$$

Answer

14.15 eV

Answer

13.6 eV

Answer

12.08 eV

Answer

15.85 eV

Atoms & Nuclei

15 eV is given to electron in 4th orbit then find its final energy when it comes out of H-atom.

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