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

What is r_s ?

  1. Mar 20, 2010 #1
    vfxkw6.jpg
    r_s is the radius of a sphere volume equals ...
    what is volume per conduction electron?
     
  2. jcsd
  3. Mar 20, 2010 #2
    what is this volume like?
     
  4. Mar 20, 2010 #3
    Volume is like another other volume, it's a 3D region of space. In this case the region is taken to be sphere of radius r_n. And within that volume you have N number of conduction electrons.

    Divide that and you get a density of conduction electrons per volume or vice-versa.
     
  5. Mar 20, 2010 #4
    "Divide that and you get a density of conduction electrons per volume or vice-versa."

    divide what?and by what?
    density is a mass divided by volume
    there is no such thing here
     
  6. Mar 20, 2010 #5

    sophiecentaur

    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    Density, in this case, refers to the number (not the mass) per unit volume. It (or the reciprocal) tells you how much room a conduction electron has 'to itself' or the space between conduction electrons.
    When we talk of Population Density, we don't mean the Mass, either. It's a fairly common English / Technical use of the term density.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook