Modern Physics Ques 45
- The ratio of the kinetic energy of the $n=2$ electron for the $H$ atom to that of $He^{+}$ion is
$(2008,4$ M)
(a) $1 / 4$
(b) $1 / 2$
(c) $1$
(d) $2$
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Answer:
Correct Answer: 45.(a)
Solution:
- Kinetic energy $K \propto Z^{2}$
$ \therefore \quad \frac{K _H}{K _{He^{+}}}=(\frac{1}{2}){ }^{2}=\frac{1}{4} $