question_answer

Energy of an electron in an excited hydrogen atom is - 3.4 eV. Its angular momentum will be: \[h=6.626\times {{10}^{-34}}J-s\]

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) \[3.72\times {{10}^{-34}}J\ \sec \]

Correct Answer: C

Solution :

[c] The electron is in the second orbit (n=2) Hence \[=2.11\times {{10}^{-34}}J\text{-}sec\]