The ground and first excited state energies are $E_1$ and $E_2$ respectively. Which pair of species has same…

The ground and first excited state energies are $E_1$ and $E_2$ respectively. Which pair of species has same energy? [Note that energy is indicated in the bracket].
  1. $\mathrm{H}\left(\mathrm{E}_1\right), \mathrm{Li}^{2+}\left(\mathrm{E}_2\right)$
  2. $\mathrm{He}^{+}\left(\mathrm{E}_1\right), \mathrm{Be}^{3+}\left(\mathrm{E}_2\right)$
  3. $\mathrm{He}^{+}\left(\mathrm{E}_1\right), \mathrm{Li}^{2+}\left(\mathrm{E}_2\right)$
  4. $\mathrm{H}\left(\mathrm{E}_2\right), \mathrm{Be}^{3+}\left(\mathrm{E}_1\right)$

Solution

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Asked in: AP EAMCET 2017 (24 Apr Shift 1)

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