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!

Mass & Energy

  1. Jul 1, 2013 #1
    1. The problem statement, all variables and given/known data

    If an electron and proton (both initially at rest and
    far apart) come together to form a hydrogen atom,
    13.6 eV of energy is released (mostly as light). By
    how much does the mass of an H atom differ from the
    sum of the electron and proton masses? What is the
    fractional difference ΔM / (m_e + m_p) ?


    2. Relevant equations
    E= √( (pc)^2 + (mc^()2)^2 )

    E of photon= 13.6 eV
    3. The attempt at a solution

    Any help on how to proceed?
    Can I say that energies of rest masses of proton and electron - 13.6 eV = Energy in H?

    Thanks
     
  2. jcsd
  3. Jul 1, 2013 #2
    You can assume p=0. Then find the change in total energy!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Mass & Energy
Loading...