There is relatively little empty space between atoms in solids and liquids, so that the average density of an atom is about the same as matter on a macroscopic scale—approximately 10^3 kg/m^3. The nucleus of an atom has a radius about 10^-5 that of the atom and contains nearly all the mass of the entire atom.
(a) What is the approximate density (in kg/m^3) of a nucleus? _____ kg/m^3
(b) One remnant of a supernova, called a neutron star, can have the density of a nucleus. What would be the radius (in m) of a neutron star with a mass 1.1 times that of our Sun (the radius of the Sun is 7 Ă— 10^8 m)? ____ m