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/sci/ - Science & Math

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4749689 No.4749689 [Reply] [Original]

In Richard Feynmann's lectures on QED, he says the following: "..an electron and a photon have no internal structure, to as small as we've been able to look so far experimentally which is to distances of 1/10 millionth the size of an atom."

How can he be sure that the electron and proton can be considered a point.. don't we USE electrons measure these small distances?

>> No.4749701

It's tested by firing electrons at other particles and seeing if the way they scatter is consistent with what we predict for point particles subject to known forces.

>> No.4749723

I never trusted Richard Feynmann after I learned he was a racist. Disgusting, really

>> No.4749739

Dude, Richard Feynman didn't believe in global warming.

>> No.4749748

http://arxiv.org/abs/hep-ph/0104165

>> No.4749771
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4749771

>>4749689
If electrons and photons had some internal structure then their scattering patterns would be completely different.

As far as we can tell the scattering patters are that of a "point particle" (no bigger then 1/10 millionth the size of an atom). If they do have some internal structure smaller then this, then we will have to wait until we have more accurate machines/experiments.

So we can treat them as point particles for now, because even if they are not, our equipment/experiments are unable to detect such a small internal stucture. With out current technology they all end up looking like point particles anyway.

Get it?

>>4749723
>>4749739
Trolls

>> No.4749873

>>4749771
OK ya that is what I was looking for, thanks.

>> No.4749878

Also, in his last lecture where he describes all the problems with the QED theory.. have we solved any of them or still looking?

>> No.4749881

>>4749723

lol feynman was racist?

>> No.4749886

>How can he be sure

because most atheists think they're right about everything

>> No.4749923

>>4749878
Well, we now know that field theories with renormalization are exactly what you expect to get when you take unknown physics and approximate it with a theory that ignores the details at the very small scales that we haven't yet probed experimentally. So I wouldn't exactly call it solved, but it's not very mysterious.

>> No.4749935
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4749935

>an electron and a photon have no internal structure, to as small as we've been able to look so far experimentally which is to distances of 1/10 millionth the size of an atom.
>to as small as we've been able to look so far experimentally which is to distances of 1/10 millionth the size of an atom
>to as small as we've been able to look so far
>How can he be sure that the electron and proton can be considered a point

>> No.4749942

>>4749935
http://en.wikipedia.org/wiki/Preon#The_mass_paradox

>> No.4750033

>>4749739

Is there really at least one person that fell for that? Jesus Christ.

>> No.4750081

>>4749723

You're thinking of Ghandi.