An automobile has a vertical radio antenna 1.10 m long. the automobile travels at70.0 km/h on a horizontal road wherethe earth's magnetic field is 50.0 µt, directed toward thenorth and downwards at an angle of 65.0° below thehorizontal.
(a) specify the direction the automobile should move in order togenerate the maximum motional emf in the antenna, with the top ofthe antenna positive relative to the bottom.

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?