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A gas hydrogen like atoms can absorb rad...

A gas hydrogen like atoms can absorb radiations of `68eV`. Consequently, the atoms emit radiations of only three different wavelengths. All the wavelengths are equal or smaller than that of the absorbed photon.
(`a`) Determine the initial state of the gas atoms.
(`b`) Identify the gas atoms.
(`c`) Find the minimum wavelength of the emitted radiation.
(`d`) Find the ionization energy and the respective wavelength for the gas atoms.

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