Most workers in nanotechnology are actively monitored for excess static charge buildup. the human body acts like an insulator as one walks across a carpet, collecting −50 nc per step. what charge buildup will a worker in a manufacturing plant accumulate if she walks 3535 steps? how many electrons are present in that amount of charge?

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?