A3.5kg block of lead at 14.4 °c comes in contact with a block of copper at 88.4 °c. they come to equilibrium at 55.9 °c. what was the mass of the copper block?

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?