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

Homework Help: Relativistic Energy

  1. Dec 9, 2008 #1
    1. The problem statement, all variables and given/known data
    A radium isotope decays to a radon isotope by emitting an α particle (a helium nucleus) according to the decay scheme 226Ra --> 222Rn + 4He. The masses of the atoms are 226.0254 u (226Ra), 222.0176 u (222Rn), and 4.0026 u (4He). What is the total kinetic energy of the decay products (in MeV)?

    2. Relevant equations
    E0=mc2
    E=gamma*mc2
    K=gamma*mc2-mc2
    E=K+E0
    1u=931.494 (MeV)/c2

    3. The attempt at a solution
    I really don't know what to do for this...
     
  2. jcsd
  3. Dec 9, 2008 #2
    Please help!
    This concept is confusing for me and once I understand this, it will make the rest of my problems much easier to solve.
     
  4. Dec 9, 2008 #3
    well...how much more massive is the input (radium), than the output (Radon and a Helium nucleus)....I'm not sure if you are confused by the notation, the 4He should be one helium nucleus with 4 nucleons.

    ~Lyuokdea
     
  5. Dec 11, 2008 #4

    malawi_glenn

    User Avatar
    Science Advisor
    Homework Helper

    calm down, wait more than 13minutes before bumping thread :-)
     
  6. Dec 11, 2008 #5
    << complete solution deleted by berkeman >>
     
    Last edited by a moderator: Dec 11, 2008
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook