An astronaut is orbiting the Earth in Geosynchronous orbit.

a) The net force acting upon the astronaut is zero.

a. True
b. False
c. Not enough information is given

b) There is only one altitude above the Earth at which the astronaut can be orbiting?

a. True
b. False
c. Not enough information is given

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?