1. Limited time only! Sign up for a free 30min personal 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!

Fermi's constant

  1. Mar 9, 2008 #1
    what is the value of fermi's constant ( GF ) in SI units?
    I tried to work it out, but it seems that I'm wrong, I got a value of: 6.5 X 10(41) J(-2)

    Does it make sense?
     
  2. jcsd
  3. Mar 9, 2008 #2
    Google calculator gives:

    [tex]
    G_F = 4.54376275 \times 10^{14} J^{-2}
    [/tex]

    where

    [tex]
    \frac{G_F}{(\hbar c)^3} = 1.16637 \times 10^{-5} GeV^{-2}
    [/tex]

    I used the following code in Google:

    Code (Text):

    1.16637*10^-5 (GeV)^-2 in (Joules)^-2
     
     
  4. Mar 9, 2008 #3
    so, you mean Gf / (h.bar X c) ^ 3 = 4.5 X 10 (14),,, [ not the Gf itself] right?
     
  5. Mar 9, 2008 #4
    how to get it in cgs units,,, I don't know how to use google to convert the units!
     
  6. Mar 9, 2008 #5

    pam

    User Avatar

    If you know it in Joules, just convert Joules to ergs.
    You can do it in your head if google fails you.
     
  7. May 5, 2009 #6
    what is then Gf2=5.29 * 10-38 cm2/GeV2?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Fermi's constant
  1. Fermis paradox (Replies: 0)

  2. Fermi electron (Replies: 4)

  3. Degenerate fermi gas (Replies: 0)

Loading...