Qns On Protons


by Delzac
Tags: protons
Delzac
Delzac is offline
#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
Phys.Org News Partner Science news on Phys.org
Better thermal-imaging lens from waste sulfur
Hackathon team's GoogolPlex gives Siri extra powers
Bright points in Sun's atmosphere mark patterns deep in its interior
neutrino
neutrino is offline
#2
May17-06, 09:18 AM
P: 2,048
(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
jhmar is offline
#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
Delzac is offline
#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
Delzac is offline
#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
disregardthat is online now
#6
May21-06, 02:51 PM
Sci Advisor
P: 1,686
what is quarks made of?
dav2008
dav2008 is offline
#7
May21-06, 02:53 PM
PF Gold
dav2008's Avatar
P: 623
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
Lyuokdea is offline
#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
neutrino is offline
#9
May22-06, 06:57 AM
P: 2,048
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.


Register to reply

Related Discussions
A protons Min KE Advanced Physics Homework 2
Remving Protons Advanced Physics Homework 1
distance between two protons Introductory Physics Homework 2
Protons decaying High Energy, Nuclear, Particle Physics 2
Protons electrons.... Atomic, Solid State, Comp. Physics 4