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Homework Help: Physics Thermal Properties HW Problem

  1. Dec 3, 2013 #1
    1. The problem statement, all variables and given/known data

    A deuteron is the nucleus of a hydrogen isotope and consists of one proton and one neutron. The
    plasma of deuterons in a nuclear fusion reactor must be heated to about 300 million K.
    (a) What is the RMS speed of the deuterons? Is this a significant fraction of the speed of light c =
    3 x 10^8 m/s?
    (b) What would the temperature of the plasma be if the deuterons had an RMS speed equal to
    0.10 c?

    R=8.314; T=300E6K

    2. Relevant equations


    3. The attempt at a solution

    I know how to solve this, but I dont get the first part of the question. how do you find M? I tried M=1.008, but that doesnt make sense.
    Last edited: Dec 3, 2013
  2. jcsd
  3. Dec 3, 2013 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    If a deuteron has one proton and one neutron, does it make sense that M = 1.008?

    After all, you can look these things up on the internet.
  4. Dec 3, 2013 #3
    oh, thanks. I just add Mp + Mn to get M...right?
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