Outline the experimental evidences for the quantum theory of matter.

Outline the experimental evidences for the quantum theory of matter.

Outline the experimental evidences for the quantum theory of matter.

The quantum theory of matter states that energy of a radiation exists in discrete packets of magnitude hf where h is Plank’s constant and f is the frequency. Some evidences are

  • Photoelectric effect: to liberate an electron from a metal surface, a quantum (or packet) of energy called work function which is characteristic of the metal has to be supplied.
  • Optical spectra: a line in optical emission spectrum indicates presence of a particular frequency, f, of light considered to arise from loss of energy which occurs in an excited atom when electron jumps directly or in steps from a higher energy level E2 to lower energy level (s), E1. The frequency of a photon= hf = E1 – E2.
  • X-ray line spectra: electron transition from one shell to another leads to liberation of energy in packets which are characteristic of the target atom

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