Q1. Sue pumps up a bicycle tyre. As she does so, she notices that the pump becomes hot.
Where, and how, was the energy stored before it was transferred in pumping up the tyre?

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?