Re: electron

In article <W_nbe.52225$Z14.42457@xxxxxxxxxxxxxx>,
patrick <networkone@xxxxxxxxxx> wrote:
>The electron charge to mass ratio e/m is known from experiments. So there is
>no doubt about that.
>
>
>But has experiment established for sure the absolute mass and charge e and m
>independently?
>In most calculations in QM and QED it is the ratio e/m that is used i think?

It's been known for about a hundred years.

http://dbhs.wvusd.k12.ca.us/webdocs/AtomicStructure/Determine-electron-charge.html

I don't know how modern measurements are done, but they might involve a
velocity selector and an energy-sensitive detector.

>
>Surely until e and m is established for sure there must be doubt about the
>electrons extent and whether it is a single particle or a collection of sub
>particles?

The values of e and m have very little to do with whether the electron has
size or whether it's a single particle. E.g. the proton has the same
magnitude of charge as the electron, and a known m, and it is composite.
The muon has the same charge but a larger mass as the electron, and it is
elementary.

The most straightforward way to explore the electron's composition is by
scattering experiments. Point particles scatter differently than
composite particles, that's how the proton structure was found.

--
"You're not as dumb as you look. Or sound. Or our best testing
indicates." -- Monty Burns to Homer Simpson
.

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