In H-spectrum, longest wavelength of Lyman is \( 120 \mathrm{~nm} \) and shortest wavelength of ...

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In H-spectrum, longest wavelength of Lyman is \( 120 \mathrm{~nm} \) and shortest wavelength of Balmer is \( 360 \mathrm{~nm} \). From this data, find longest wavelength of photon, that can ionize this \( \mathrm{H} \)-atom.
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