Misc: what does p.e.t stand for, in medicine?

Questions

In electronics, device used to propagate radio or electromagnetic waves or to capture radio waves?

In england, the speaker of the house is not allowed to do what?

In english what does arrivederci mean?

In every deck of cards the king of hearts is sticking what through his head?

In full commonwealth of Virginia, state in the eastern U S & one of the original 13 colonies?