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JEE Main Physics Class 12 Atoms and Nuclei Part 2 Questions
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Question : 64
Total: 100
According to Bohr atom model, in which of the following transitions will the frequency be maximum ?
[24 Feb 2021 Shift 2]
n
=
4
to
n
=
3
n
=
2
to
n
=
1
n
=
5
to
n
=
4
n
=
3
to
n
=
2
Validate
Solution:
Let
n
f
,
n
i
be the final and initial orbit.
As we know that,
1
λ
=
109
×
10
7
[
1
n
f
2
−
1
n
i
2
]
Now, checking for each option, we get
(a)
1
λ
∝
[
1
3
2
−
1
4
2
]
=
[
1
9
−
1
16
]
=
0.05
.
.
.
(i)
(b)
1
λ
∝
[
1
1
−
1
4
]
=
0.75
... (ii)
(c)
1
λ
∝
[
1
16
−
1
25
]
=
0.0225
... (iii)
(d)
1
λ
∝
[
1
4
−
1
9
]
=
0.14
... (iv)
The option (b) has highest value.
Since, frequency,
f
=
C
λ
⇒
f
∝
1
λ
∴
Frequency will be maximum for transition
n
=
2
to
n
=
1
.
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