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Qns On Protons

by Delzac
Tags: protons
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Delzac
#1
May17-06, 09:08 AM
P: 389
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
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neutrino
#2
May17-06, 09:18 AM
P: 2,046
(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
#3
May17-06, 09:22 AM
P: 76
Charge values are: u = +2/3; d = -1/3
2 up + 1 down = +1
add the charge values.

Delzac
#4
May17-06, 09:25 AM
P: 389
Qns On Protons

sry i meant 2 " up" quarks and 1 " down" quark. does it work now?
Delzac
#5
May17-06, 09:27 AM
P: 389
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
#6
May21-06, 02:51 PM
Sci Advisor
P: 1,807
what is quarks made of?
dav2008
#7
May21-06, 02:53 PM
PF Gold
dav2008's Avatar
P: 621
Quote Quote by 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
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
#8
May21-06, 03:18 PM
P: 198
Quote Quote by 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.
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
#9
May22-06, 06:57 AM
P: 2,046
Quote Quote by 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
I had this feeling that my teacher was wrong. I should've checked what he said, though. I stand corrected...Thanks.


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