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Atomic physics - mass ration

  1. Dec 16, 2006 #1
    1. The problem statement, all variables and given/known data

    which of the following mass ration is ture?

    Mass of alpha-particles: mass of neutrons : mass of gamma- rays
    equal to

    A. 4 : 1 : 0
    B. 4 : 0 : 1
    C. 1 : 1 : 1
    D. 1 : 1 :0


    2. Relevant equations

    nil

    3. The attempt at a solution

    I thought it's D
    but the correct answer is A.
    I can't get it..
     
  2. jcsd
  3. Dec 16, 2006 #2

    rsk

    User Avatar

    An alpha particle consists of 2 protons and 2 neutrons, which are of equal mass (well, very nearly, anyway).
     
  4. Dec 16, 2006 #3
    wow... silly me.
    Thank you!
     
  5. Dec 16, 2006 #4

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Alpha particle (in the past aka "alpha radiation") is the common name for the helium nucleus.

    Daniel.
     
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