Qns On Protons

  1. Hi,

    Given that a " up " quark has charge of 2/3e ; a "down" quark has a charge of - 1/3e, where e is the elementary charge (+1.6 x 10^-19 C).

    can is say that a proton contain 3 " up " quark and 1 "down" quark?

    the charge in the end seems to add up to +1.

    is what is have said correct?

    p.s. i just started learning particle physics
     
  2. jcsd
  3. (3 x 2/3) + (1x(-1/3)) = 1?

    Incase you meant 3 down quarks, then that doesn't work either - Add the masses of the quarks.
     
  4. Charge values are: u = +2/3; d = -1/3
    2 up + 1 down = +1
    add the charge values.
     
    Last edited: May 17, 2006
  5. sry i meant 2 " up" quarks and 1 " down" quark. does it work now?
     
  6. another thing i understand is that quarks isn't actually IN the proton itself isn't? so how can we say that to proton CONTAIN quarks IN it
     
  7. disregardthat

    disregardthat 1,834
    Science Advisor

    what is quarks made of?
     
  8. dav2008

    dav2008 624
    Gold Member

    The proton is made up of quarks.

    There aren't quarks "inside" of a proton because that implies there exists a structure called a proton independently of quarks.

    Edit: Well I guess there are also gluons.
     
    Last edited: May 21, 2006
  9. Summing the masses wouldn't give you any useful information for finding the number of quarks in a proton or neutron, without a lot of extra information. The sum of the quark masses is only a small percentage of the mass of a proton.

    ~Lyuokdea
     
  10. I had this feeling that my teacher was wrong. :grumpy: I should've checked what he said, though. :redface: I stand corrected...Thanks. :smile:
     
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