I've had both switches, and a wireless router that make a high pitched eletrical noise.

What I wonder is how the noise changes/is corelated to network activity? The noise will be bursty in line with any network activity.

in a solid state device what is causing that?

If you remove a large number of electrons (in the order of 1E4 per mole) from a metal, would this affect its melting point in any way? Therefore would it be possible to use a Van der Graaf type generator running on renewable sources to lower the energy requirements on an industrial scale?

Facts:

1. Atoms are made up of 99.9%(or even more) empty space.
2. Atoms cannot pass through each other due to the fast spinning electrons repelling each other when they come in contact.
3. Zero temperature stops electron activity in an atom.

So does zero temperature means atoms can pass through each other?

Does a substance under zero temperature shrink to 99.9% of it's mass?

I tried searching in many different sites, and yet I have a difficulty understanding what is electron excitation, in particular - how do electrons manage to alter their energy levels? Could anyone please recommend me some useful links on this subject?

Thank you in advance

Particle accelerators such as that at CERN accelerate particles to high speeds before colliding them and measuring the particles given off.  However it is almost always protons that are collided, or ions or neutrons. Why doesn't anyone ever collide electrons?  Even if you did collide electrons, what sort of things would you see given off?

EDIT:

thanks for the answer, i'm also interested in what sort of particles are formed from electron collisions and how much energy is needed to form these particles.

The mail.

Mechanical 78 RPM phonograph records.

Engines, gas, diesel, turbine, steam.

Motion pictures, silent.

The power grid.

Nuclear plants.

Image - wikipedia

How do anti-static sprays work? Where do the electrons go to or come from to neutralise a charged surface?

John Chapman, Perth, Western Australia

I was wondering about the plausibility of a "joke theory" I saw in an online web comic (www.qwantz.com not sure where it is anymore though). Essentially it suggested that all electrons are the same electron except it just travels through time - explaining their being identical.

Originally I almost dismissed the idea pretty quickly. However, since reading the most recent New Scientist in which the main article said that quantum particles such as electrons and photons have no place on the arrow of time (or something like that). It seems that this theory is more plausible if not just for me.

At least in the case that the electron has "failed to kill itself" (/will fail to kill itself / is currently failing to kill itself).

Thanks for your views and help in advance!