Question

Minimum excitation potential of Bohr's first orbit in hydrogen atom is.

• A. 13.6 V
• B. 3.4 V
• C. 10.2 V
• D. 3.6 V

Answer 1

Answer: (C)

10.2 V

Answer 2

Excitation potential$= \frac{\text{Excitation energy}}{e}$

Minimum excitation energy corresponds to excitation from $n = 1$ to $n = 2$

∴ Minimum excitation energy in hydrogen atom

$= - 3.4 - ( - 13.6) = + 10.2eV$

so minimum excitation potential = 10.2 eV.