Question

Emission spectrum of hydrogen first discovered and the region of electromagnetic spectrum it belongs

Answer 1

Balmer spectrum of hydrogen was discovered first and it lies in Visible region.

Explanation:

            In the year 1885, Balmer showed it for the first time that the wave numbers of spectral lines present in the visible region in Hydrogen spectrum and is given by formula:
Wave number =v=RH[1/n₁²-1/n₂²]
=109677(1/2²-1/n²)
here n=3,4,5.....
 

Answer 2

Balmer series of the hydrogen spectrum was first discovered in 1885 by scientist John Balmer. It belonged to the visible region of the spectrum. The wave number of any line in the Balmer series is given by
ν = Rh(1/n₁² - 1/n₂²)
Rh = 109667 cm⁻¹
Here, n₁ = 2, and n₂ = 3,4,5......