Continental Hot Spots – Yellowstone Hot-Spot Trail. Use the Path tab on the Ruler tool to measure the distance between the Problem 21 placemarks (cm) along the hot-spot trail. Calculate the average velocity of the North American Plate in cm per year, using 16.5 Ma and 0.63 Ma for the two placemarks. a) ~1.9 cm per year
b) ~4.2 cm per year
c) ~8.8 cm per year
d) ~15 cm per year

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?