Question
Question: The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiatio...
The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from–
A
2 ® 1
B
3 ®2
C
4 ®2
D
5 ®4
Answer
5 ®4
Explanation
Solution
4 ® 3 Ž emitted energy = 0.65 eV
lU.V. < lI.R.
EU.V. > EI.R.
(1) when electron transit 2 ® 1 emitted
energy is 10.2Z2eV
(2) 3 ® 2 Ž 1.92 Z2 eV
(3) 4 ® 2 Ž 2.55 Z2eV
(4) 5 ® 4 Ž less than 0.65Z2eV
So option (4) is correct.