Which of the following is always true about the particles that make up matter? A. They can only be found in solid substances. B. They are too small to be seen with only our eyes. C. They are the same size in all substances, D. They are locked into regular arrangements.​

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?