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I What is plasma frequency?

  1. Dec 3, 2018 #1
    Hello, I am having a very hard time understanding what is plasma frequency by reading definitions. I know, for example, that metals have a metallic bond and can be analysed like plasma because of an equal distribution of electrons in electron gas and positively charged atoms.

    I know metals are very good at reflecting light but at certain frequency their reflectivity drops very fast and this frequency where the drop happens is, I think, what's called - plasma frequency.

    The question: Why do metals reflect light and why at certain frequency they stop reflecting?
  2. jcsd
  3. Dec 3, 2018 #2


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    Gold Member

    There is a description in the following video which is quite easy to follow:-
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