KVPY2016PhysicsCenter of Mass, Momentum and Collision
An electron with kinetic energy E collides with a hydrogen atom in the ground state. The collision will be elastic
Options
- AFor all values of E
- BFor 10.2 eV < E < 13.6 eV only
- CFor E < 10.2 eV
- DFor 0 < E < 3.4 eV only
Correct answer
B. For 10.2 eV < E < 13.6 eV only
Step-by-step solution
When e ⁻ collide with atom which is massive in comparison to e ⁻ . Max possible loss of KE = KE of e ⁻( initial KE )= E if this E is less than min excitation energy then collision is elastic E < 10.2 eV (Minimum excitation energy)