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The first emission line in the H-atom spectrum in the Balmer series will have the wave number:-

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Important Questions on Structure of Atom

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What transition in He+ will have the same λ as the I line in Lyman series of H-atom?
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In H-atom, the electron transits from 6th  orbit to 2nd  orbit in multi-step. Then total spectral lines(without Balmer series) will be:-
 
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An atom has n energy level, then the total number of lines in its spectrum are
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The figure indicates the energy level diagram for the origin of six spectral lines in the emission spectrum(e.g. line number 5 arises from the transition from level B to X) which of the following spectral lines will not occur in the absorption spectrum: -

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A certain electronic transition from an excited state to the ground state in a sample of H-atoms gives rise to maximum of three lines in the ultraviolet region of the spectrum. How many lines does this transition produce in the infrared region of the spectrum?
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Four lowest energy levels of H- atom are shown in the figure. The number of emission lines could be 

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The number of absorption lines in the following figure could be :-
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If 9.9 eV energy is supplied to the H atom, the number of spectral lines emitted is equal to: