What counts as a "measurement" in QM?
"Measurements" in quantum mechanics seem to have an important role. They collapse the Schrodinger wave equation, for example (please correct me if that's no longer the modern view). The state of a system BETWEEN MEASUREMENTS is what is inherently...
Hi, I'm a little confused about the nature of fields in quantum field theory. I sometimes see people make reference to an "electron field" or other matter field of some sort, and in my understanding, in quantum field theory, ALL the different fundamental particles can be represented as...
Hi, the title above is a specific instance of a more general question. I'm basically wondering why the atoms in a wall would prevent visible light from passing through, yet allow both X-rays (which are HIGHER frequency) and radio waves such as 802.11b wireless internet (which are LOWER...