Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Resistor Nyquist-Johnson noise formula question

  1. May 2, 2010 #1
    Hi all -- I had a question about the Nyquist-Johnson noise formula:


    which of course can be approximated for most purposes as [itex]$ E_{\nu}^{2}d\nu=4R_{\nu}kTd\nu$[/itex].

    I'm just wondering why the formula has [itex]$ exp(h\nu/kT)-1$[/itex] in the denominator? I would have expected [itex]$ exp(h\nu/kT)+1$[/itex] as electrons are fermions, so obey Fermi-Dirac statistics as opposed to Bose-Einstein. Sure I'm missing something obvious!

  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted