What is the acceleration of a piece of dust on an old-fashioned record album, 0.55 m from the center, if the record is spinning at 45 rpm (rotations/minute)? a. 5.82 m/s2
b. 3.35 m/s2
c. 4.68 m/s2
d. 12.3 m/s2

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?