Question

The ionization energy of hydrogen atom in excited state is:

• A. (A) 4 eV
• B. (B) 3.4 eV
• C. (C) 1.51eV
• D. (D) 1.9eV

Answer 1

Answer: (B)

(B) 3.4 eV

Answer 2

Explanation:
The ionization energy of the hydrogen atom in the excited state means the atom is already in the first excited state and n = 2.The energy of the electron in any excited state is given by,En=−13.6Z2n2eVThe above equation can be written for the excited state of the hydrogen atom as,En=−13.622eV=−3.4eVHence, the correct option is (B).