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

Rest energy of the electron

  1. Dec 14, 2014 #1
    Electrons in a particle accelerator reach a speed of 0.999c relative to the laboratory. Is the rest energy of the electron equal to zero?
     
  2. jcsd
  3. Dec 14, 2014 #2

    Nugatory

    User Avatar

    Staff: Mentor

    The kinetic energy of an electron (or anything else, for that matter) at rest is zero.

    The total energy of the electron, calculated from ##E=\gamma{m_0}c^2## or ##E^2=(m_0c^2)^2+(pc)^2"##, is .511 511 MeV when the electron is at rest and greater when it is moving and the kinetic energy is non-zero.

    [Edit - left the decimal point out the first time around]
     
    Last edited: Dec 14, 2014
  4. Dec 14, 2014 #3

    jtbell

    User Avatar

    Staff: Mentor

    The rest energy of an electron is 0.511 MeV, regardless of how fast it is moving.
     
  5. Dec 14, 2014 #4

    Matterwave

    User Avatar
    Science Advisor
    Gold Member

    .511MeV or 511keV bro, 511MeV is some ginormous electron.
     
  6. Dec 14, 2014 #5

    Nugatory

    User Avatar

    Staff: Mentor

    :)
     
  7. Dec 14, 2014 #6

    jtbell

    User Avatar

    Staff: Mentor

    It's overweight even for a muon. :oldruck:
     
  8. Dec 14, 2014 #7
    thanks..
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Rest energy of the electron
  1. Rest Energy concept ? (Replies: 10)

  2. Finding the rest energy (Replies: 33)

  3. Rest energy (Replies: 3)

Loading...