A team of researchers calculates that a glacier will melt completely away in the next 100 years. Which land structure will most likely be left behind after the glacier melts? A. an arch
B. a deep canyon
C. a table mountain
D. a valley

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?