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Hydrogen spectrum and spectral series
JEE Advanced level
Single correct option
Difficulty 3 of 3
as092
The ratio (longest wavelength of the Balmer series) : (shortest wavelength of the Paschen series) of hydrogen is
A
4
5
B
9
5
C
5
9
D
5
4
Answer: D
Balmer longest:
λ
=
36/
(
5
R
)
. Paschen shortest (limit):
λ
=
9/
R
. Ratio
=
(
36/5
)
/9
=
0.8
=
4/5
.
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