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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!