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

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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 $n=4$.



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