A) \[\frac{5x}{36}\]
B) \[5x\]
C) \[7.2\,x\]
D) \[\frac{x}{6}\]
Correct Answer: A
Solution :
Energy of electron in Und orbit \[({{E}_{2}})=\frac{-x}{{{2}^{2}}}=\frac{-x}{4}kJ\] Energy of electron in the IIIrd orbit \[({{E}_{3}})=\frac{-x}{{{3}^{2}}}=-\frac{x}{9}kJ\] Energy required for jump from Und to IIIrd orbit \[={{E}_{3}}-{{E}_{2}}\] \[=-\frac{x}{9}-\left( -\frac{x}{4} \right)\] \[=\frac{x}{4}-\frac{x}{9}=\frac{5x}{36}kJ\]
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