Atoms And Nuclei Question 130
Question: If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of $ L{{i}^{++}} $ is [AIEEE 2003]
Options:
A) 122.4 eV
B) 30.6 eV
C) 13.6 eV
D) 3.4 eV
Show Answer
Answer:
Correct Answer: B
Solution:
$ E_{n}=\frac{13.6}{n^{2}}\times Z^{2}. $ For first excited state n = 2 and for $ L{{i}^{++}},\ z=3 $ Þ $ E=\frac{13.6}{4}\times 9=30.6\ eV $
