Consider a spherical gaussian surface of radius r centered at the origin. a charge q is placed. inside the sphere. where should the charge be located to maximize the magnitude of the flux of the electric field through the gaussian surface?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?