On 2007-08-11, Ian Iveson wrote:
John wrote:

[snip lots of good stuff]

Atoms have got much more complicated than when I was at school.

Not really. It's the unification of the small and the large scale
theories (and the incorporation of gravity) that makes even the
Hilbert-space quantum theory look simple,


Interesting and informative, thanks.

Actually from looking up on the web this morning I see that as a
consequence of the production of deceleration X-rays (Bremsstrahlung)
not converting anywhere near all of the electron energy into X-rays, there
is something close to a voltage threshold (but not in the quantum sense).

See http://hyperphysics.phy-astr.gsu.edu...tum/xrayc.html (the
bottom of the page) for how the intensity varies with anode voltage from
20 kV up.

--
John Phillips