Frank and Hertz experiment proves that

Frank and Hertz experiment proves that
  1. light moves in the form of waves as well as particles
  2. the electron does not radiate energy, while moving in an orbit
  3. the energy states of an atom are quantised
  4. the whole of the positive charge of the atom is concentrated in the nucleus

Solution

Frank an Hertz's experiment demonstrated the existence of excited states in mercury atoms. It confirms the prediction of quantum theory that electrons occupy only discrete, quantised energy states.

Asked in: AP EAMCET 2020 (17 Sep Shift 1)

Practice more Structure of Atoms and Nuclei questions on Aicharya