"Consider an electron in a box with width a = 1 A (angstrom). Give an estimation of the force exerted by the electron on the box walls during an impact."
I've been looking at a practice test for an introductory class in quantum physics, and I've found a really weird question. It asks for an estimation of the force that an electron exerts on the walls of a box of known length during a collision.
This seems like an entirely nonsense thing to ask...