Quantum Physics (AS)

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  • Created by: Emily
  • Created on: 03-05-12 17:33

Definition of the Photoelectric effect- When electrons are emitted from the surface of a metal when electro magnetic radiation about a certain frequency (threshold frequency) is directed at the metal. This is evidence of wave-particle duality.

E=hf   (E is the energy of photons, h is Plank's constant, f is frequency)

V=f times wavelength    (V=speed... speed of light)

Radio Waves have the longest wavelength and the smallest frequency whilst Gamme rays have the shortest wavelength and the biggest frequency out of the electromagnetic spectrum.

The Energy of a photon = work function + kinetic energy

Work function is the minimum energy required to release an electron from the surface of a metal.

Threshold frequency = work function divided by Planck's constant.

A photon is a quantised packet of energy.

The Photoelectric effect is evidence for wave-particle duality of light and is evidence of photons. 

To find the number of electrons released per second divide…


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