Hi All, I am preparing for PhD quals and have been looking at problems from other universities. I came across this one and am stumped on how to tackle it. " Assume that the neutron density in a neutron star is 30.1/fm (that is 0.1 neutron per cubic Fermi). Assuming T=0 and ignoring any gravitational forces calculate the ratio of neutrons to protons to electrons.Hint: determine their Fermi energy." Even with the hint not sure. I would appreciate any thoughts!