Nuclear & Particle Physics - Franck-Hertz Experiment

The Franck-Hertz experiment and related scattering experiments show that

1. electrons are always scattered elastically from atoms
2. electrons are never scattered elastically from atoms
3. electrons of a certain energy range can be scattered inelastically, and the energy lost by electrons is discrete
4. electron always lose the same energy when they are scattered inelastically
5. there is no energy range in which the energy lost by electrons varies continuously

(GR8677 #47)

Solution:

Franck–Hertz experiment: confirmed Bohr's quantized model of the atom by demonstrating that atoms could indeed only absorb (and be excited by) specific amounts of energy (quanta).

Answer: C