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  4. The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are

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Q. The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are

WBJEEWBJEE 2014Structure of Atom

Solution:

FactIn $1885$ , Balmer for the first time showed that the wave numbers of spectral lines present in the visible region in hydrogen spectrum are given by,
$\overline{ v }\left( cm ^{-1}\right)=109677\left(\frac{1}{(2)^{2}}-\frac{1}{n^{2}}\right)$
Here, $n = 3 , 4 , 5 , \ldots$
Thus, Balmer spectrum of hydrogen was discovered first and it lies in the visible region.