Calculate velocity of a 1MeV Neutron

  1. How would one calculate the velocity of a 1MeV neutron??

    I tried the following the attached formula for V/C but E is less than the rest mass which yields the square root of a negative number. Not sure what to do for this

    Attached Files:

  2. jcsd
  3. jtbell

    Staff: Mentor

    1 MeV here is surely the kinetic energy, not the total (rest plus kinetic) energy.
  4. It doesn't say. I guess that I will assume such. Is the 'E' in the equation I am using for the rest mass energy plus the kinetic energy?
  5. Matterwave

    Matterwave 3,865
    Science Advisor
    Gold Member

    Since a neutron has a higher rest mass than 1MeV, then one should safely assume that kinetic energy is what is meant here.

    The E in that equation is indeed the rest+kinetic energy.
  6. mathman

    mathman 6,751
    Science Advisor
    Gold Member

    Since the neutron rest mass is approximately 940 Mev, you probably could use E=(mv^2)/2 to get v. (v=c/22?).
    Last edited: Aug 27, 2014
  7. mfb

    Staff: Mentor

    I agree that a nonrelativistic approach should be fine - it is a very good approximation.
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