The half-life of iodine-131 is 8 days. If a sample originally contains 0.96 g of the isotope how much will remain after 8 days?
A. 0.48 g
B. 0.24 g
C. 0.06 g

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?