1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Question form Peskin Schroeder

  1. Jul 20, 2007 #1
    Sorry for bothering...
    How does righthand side of formula 5.94 is derived from its left handside after some approximation?
    Probably it is very simple question but I could't get that expression:confused:

    Thank u very much

    Attached Files:

    • page.pdf
      File size:
      227.5 KB
  2. jcsd
  3. Jul 20, 2007 #2

    George Jones

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Using [itex]e^2 = 16 \pi^2 \alpha^2,[/itex] the left side is

    [tex]\frac{2 \pi \alpha^2}{4E^2 + 4E \omega cos \theta}.[/tex]

    Now use an exact expression for [itex]E^2[/itex] and a two-term approximation to [itex]E[/itex] to get the right side.
    Last edited: Jul 20, 2007
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook