Modern Physics Ques 45

  1. 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) $2$

Show Answer

Answer:

Correct Answer: 45.(a)

Solution:

  1. Kinetic energy $K \propto Z^{2}$

$ \therefore \quad \frac{K _H}{K _{He^{+}}}=(\frac{1}{2}){ }^{2}=\frac{1}{4} $



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