A bar of iron with mass 45 kg is cooled from 50℃ to 20℃. How much thermal energy does the bar of iron lose? The specific heat of iron is 470 kg/kg*C.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

How many neutrons does plutonium -196 with an atomic number of 78.

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?