Question

An electron collides with a hydrogen atom in its ground state and excites it to n = 3. The energy given to hydrogen atom in this inelastic collision is [Neglect the recoiling of hydrogen atom]

• A. 10.2 eV
• B. 12.1 eV
• C. 12.5 eV
• D. None of these

Answer 1

Answer: (B)

12.1 eV

Answer 2

$\Delta E = 13.6\left( 1 - \frac{1}{9} \right) = 12.1$ eV