Hydrogen atom in ground state is excited by a monochromatic

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Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975 Å. Number of spectral lines in the resulting spectrum emitted will be

For the λ = 975 Å

	1	= R		1	-	1
	λ			n²₁		n²₂

where R is the Rydberg constant
Solving we get n₂ = n = 4
(∵ n₁ = 1 ground state)
Therefore number of spectral lines

=	n(n - 1)	=	4(4 - 1)	= 6
	2		2