Physics unit 3

Physics unit 3

1. The effect consists of the emission of electrons from a metal surface when electromagnetic waves of a high enough frequency are incident on the surface.

   • What actually happened
     • No emission when the frequency of light was low
     • Photoelectrons emitted with a variety of kinetic energy. This increases with frequency but unaffected by intensity
     • Number of photoelectrons emitted per second is proportional to intensity.
   • According to wave theory
     • So the higher the intensity of the wave the more energy it should transfer to each electron – the kinetic energy should increase with intensity.
       • Intensity is the power hitting a given area of the metal.

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