Qns On Protons

Delzac

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

neutrino

(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.

jhmar

Charge values are: u = +2/3; d = -1/3
2 up + 1 down = +1
add the charge values.

Delzac

sry i meant 2 " up" quarks and 1 " down" quark. does it work now?

Delzac

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

disregardthat

what is quarks made of?

dav2008

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.

Lyuokdea

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

neutrino

I had this feeling that my teacher was wrong. I should've checked what he said, though. I stand corrected...Thanks.