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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
    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.

  5. Dec 11, 2008 #4


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    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
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