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 this equation

  1. Sep 20, 2009 #1
    What is this equation I[tex]\gamma[/tex]=([tex]\Gamma[/tex]N)/D2

    It is about Intensity of ray.
    But I can't find any information about it.
    What is it? And where can I get the information?
     
  2. jcsd
  3. Sep 20, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi ATPenergy! :smile:
    I'm not sure, but it looks a bit like irradiance = radiant flux (or radiant power) per area :confused:

    see http://en.wikipedia.org/wiki/Radiant_flux" [Broken]

    what book did you get it from?
     
    Last edited by a moderator: May 4, 2017
  4. Sep 21, 2009 #3
    Hi,
    i think it is the relation between natural line width, mean life time and Planck's constant!!!
    the correct relation which i know (FWHM)*meanlifetime=hbar.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What is this equation
  1. What is this equation? (Replies: 5)

Loading...