Atoms And Nuclei Question 114
Question: Energy of an electron in an excited hydrogen atom is ? 3.4 eV. Its angular momentum will be: $ h=6.626\times {{10}^{-34}}J-s $ [UPSEAT 1999; Kerala PET 2002]
Options:
A) $ 1.11\times 10^{34}J\ \sec $
B) $ 1.51\times {{10}^{-31}}J\ \sec $
C) $ 2.11\times {{10}^{-34}}J\ \sec $
D) $ 3.72\times {{10}^{-34}}J\ \sec $
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Answer:
Correct Answer: C
Solution:
The electron is in the second orbit (n=2) Hence $ L=\frac{nh}{2\pi }=\frac{2h}{2\pi }=\frac{6.6\times {{10}^{-34}}}{\pi } $ $ =2.11\times {{10}^{-34}}J\text{-}sec $
