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Test Index
Class 12 NEET Physics Atoms and Nuclei Part 1
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© examsnet.com
Question : 7
Total: 100
Ionization potential of hydrogen atom is
13.6
e
V
.
Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be
(2006)
one
two
three
four.
Validate
Solution:
Ionisation potential of hydrogen atom is
13.6
e
V
.
Energy required for exciting the hydrogen atom in the ground state to orbit
n
is given by
E
=
E
n
−
E
1
i.e.,
12.1
=
−
13.6
n
2
−
(
−
13.6
1
2
)
=
−
13.6
n
2
+
13.6
or,
−
1.5
=
−
13.6
n
2
or,
n
2
=
13.6
1.5
=
9
or,
n
=
3
Number of spectral lines emitted
=
n
(
n
−
1
)
2
=
3
×
2
2
=
3
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