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 $



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