Heisenbergs "thought experiment" In two different quantum mechanics books I read about "thought experiments" involving using a microscope to determine the position of an electron, which were both presented as evidence to back up Heisenbergs uncertainty principle. Are there no real experiments that can be done to test the theory? In these thought experiments, microscopes are used to detect the positions of electrons (i.e. adding a light source and a microscope to the double slit apparatus in order to determine which slit the electron comes through) and the problem is that when a photon bounces off the electron, it changes its momentum so while you've now learned the position of the electron, you no longer know its momentum etc. Don't moving charged particles produce electromagnetic fields and thus, radiate energy that could be detected? Or is that only in magnetic fields?