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Byju's Answer
Standard XII
Physics
Optical Path Length
In the terms ...
Question
In the terms of Rydberg constant
R
, the wave number of the first Balmer line is :
A
R
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B
3
R
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C
5
R
36
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D
8
R
9
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Solution
The correct option is
C
5
R
36
Wave number,
¯
v
=
1
λ
=
R
(
1
n
2
1
−
1
n
2
2
)
Here
n
1
=
2
,
n
2
=
3
for the first Balmer line.
Substituting the value we get,
¯
v
=
1
λ
=
R
(
1
2
2
−
1
3
2
)
∴
¯
v
=
5
R
36
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