1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!


  1. Mar 20, 2006 #1
    Thanks for the great answers but unfortunately for you, people always want to know more.

    We know that phonons greatly alter electrical behaviour of metals at different temperatures.
    Why isn’t there a change in behaviour with temperature regarding light properties such as described in the answer.
    I’ve never looked through glass at around zero K but I imagine it never becomes opaque at any temperature.
  2. jcsd
  3. Mar 20, 2006 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2016 Award

    Because within the framework of the naive case being described, the phonon density of states are not affected by the temperature of the dielectric. Since the phonon states are the only factor in light propagation through this simple medium, you get no significant difference with change in temperature within any reasonable limits.

    This of course does not describe ALL materials since there are always exceptions to the simplest case.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: From FAQ: IS LIGHT A WAVE OR A PARTICLE?
  1. Light wave/particle (Replies: 1)