Register to reply

Size of elemetary particles

by Vampyr
Tags: elemetary, particles, size
Share this thread:
Vampyr
#1
Aug21-13, 09:08 AM
P: 28
I stumbled upon this nice link showing the universe at different scales: http://htwins.net/scale2/

However, if you scroll down to the attometer scale you get to the elementary particles which have been given sizes. Does anyone know what these sizes mean? I thought elementary particles were dimensionless and so have no strict size.
Phys.Org News Partner Physics news on Phys.org
Physical constant is constant even in strong gravitational fields
Physicists provide new insights into the world of quantum materials
Nuclear spins control current in plastic LED: Step toward quantum computing, spintronic memory, better displays
Drakkith
#2
Aug21-13, 09:18 AM
Mentor
Drakkith's Avatar
P: 12,015
I'd guess it either refers to something similar to a "classical electron radius" or it uses their wavefunction to determine the volume of space they are likely to occupy and base the size on that.
Bill_K
#3
Aug21-13, 09:18 AM
Sci Advisor
Thanks
Bill_K's Avatar
P: 4,160
Quote Quote by Vampyr View Post
I stumbled upon this nice link showing the universe at different scales: http://htwins.net/scale2/ However, if you scroll down to the attometer scale you get to the elementary particles which have been given sizes. Does anyone know what these sizes mean? I thought elementary particles were dimensionless and so have no strict size.
You're correct. Apparently what he's diagramming here is the Compton wavelength for each particle, ħ/mc. Of the six quarks, the top quark has the greatest rest mass, hence the shortest Compton wavelength. Electron (classical) is the classical electron radius, e2/mc2.

Vampyr
#4
Aug21-13, 03:31 PM
P: 28
Size of elemetary particles

Thank you!


Register to reply

Related Discussions
In binary can we have a value with deci centi mili or more lower valued prefix? Computers 14
Why Thomson scattering calls for a size-changing electron? Classical Physics 3
Is order = size ? Linear & Abstract Algebra 2
Question on Lorentz contraction and size of pancakes High Energy, Nuclear, Particle Physics 1
Size and Destiny of the Universe -nice JPG file Cosmology 11