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It is observed that some of the spectral...

It is observed that some of the spectral lines in hydrogen spectrum have wavelengths almost equal to those of the spectral lines in He+ ion. Out of the following the transitions in He+ that will make this possible is (a) n=3 to n=1 (b) n=6 to n=1 (c) n=5 to n=3 (d) n=3 to n=2

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