in a H like sample electron makes transition from 4th excited state to 2 nd stste
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Answer:
For an electronic transition from n
2
to n
1
state, the number of lines in the spectrum are equal to
2
(n
2
−n
1
)(n
2
−n
1
+1)
Here, n
2
=5 and n
1
=2
Hence, the number of lines are equal to
2
(5−2)(5−2+1)
=6
Hence, when in a H-like sample, electrons make transition from 4
th
excited state to 2
nd
state, then 6 different spectral lines are observed.
Out of these, three lines, 5→2, 4→2 and 3→2 belong to the Balmer series.
Hence, options A and C are correct.
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