Supposing the energy (in arbitrary units) of the energy levels in the hydrogen atom is given as under:
Energy level $K$ $(n=1)$ $L$ $(n=2)$ $M$ $(n=3)$ $N$ $(n=4...n=\infty)$ Energy $-864 \ a.u.$ $-216 \ a.u.$ $-96 \ a.u.$ $0 \ a.u.$
The excitation energy needed to raise the electron from $M$ level to $n = \infty$ would be:
| Energy level | $K$ $(n=1)$ | $L$ $(n=2)$ | $M$ $(n=3)$ | $N$ $(n=4...n=\infty)$ |
| Energy | $-864 \ a.u.$ | $-216 \ a.u.$ | $-96 \ a.u.$ | $0 \ a.u.$ |
The excitation energy needed to raise the electron from $M$ level to $n = \infty$ would be:
- A$192$
- B$96$
- C$188$
- D$384$
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