In a mixture of H-$H{e}^{+}$ gas $H{e}^{\cdot }$ is singley ionized He atom) H atoms and $H{e}^{\cdot }$ ions are excited to their respective first excited stated subsequently H atoms transfer their total excetation energy to $H{e}^{+}$ ions (by collisions) Assume the Bohr model of atom is exactly valid
The wavelength of light emitted in the visible regions by $H{e}^{+}$ ions after collisions with H atoms is

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