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A sample of hydrogen atom is in excited ...

A sample of hydrogen atom is in excited state (all the atoms ). The photons emitted from this sample are made to pass through a filter through which light having wavelength greater than `800 nm` can only pass. Only one type of photons are found to pass the filter. The sample's excited state initially is `[Take h c = 1240 eV -nm `, ground state energy of hydrogen atom `= - 13.6 eV]`.

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