What will be the ratio of the wave number of the 1st
line to that of the 5th line of Lyman series of Het ion ?
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Answer:
For Lyman series
n
1
=1 and n
2
=2...
For 1
st
line of Lyman series
⇒
λ
1
=RZ
2
(
(1)
2
1
−
(2)
2
1
)=RZ
2
(
4
3
)=
4
3
R
For Balmer series, n
1
=2,n
2
=3
⇒
λ
1
=RZ
2
(
(2)
2
1
−
(3)
2
1
)=RZ
2
=
36
5
R
Ratio=
4
3
R/
36
5
R⇒
4
3
×
5
36
=
5
27
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