Modern Physics 1 Question 35
32. The quantum number $n$ of the state finally populated in $He^{+}$ ions is
$(2008,4$ M)
(a) 2
(b) 3
(c) 4
(d) 5
Show Answer
Solution:
Energy given by $H$-atom in transition from $n=2$ to $n=1$ is equal to energy taken by $He^{+}$atom in transition from $n=2$ to $n=4$.