Recall that ** density** is the ratio of the mass and volume of an object:

$\overline{){\mathbf{density}}{\mathbf{=}}\frac{\mathbf{mass}}{\mathbf{volume}}}$

Also, the ** volume of a sphere** is given by:

$\overline{){\mathbf{V}}{\mathbf{=}}\frac{\mathbf{4}}{\mathbf{3}}{{\mathbf{\pi r}}}^{{\mathbf{3}}}}$

$\mathbf{V}\mathbf{=}\frac{\mathbf{4}}{\mathbf{3}}\mathbf{\pi}{\mathbf{(}\mathbf{1}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{13}}\mathbf{cm}\mathbf{)}}^{\mathbf{3}}$

**V = 4.1887 x 10 ^{-39} cm^{3}**

Neutron stars are believed to be composed of solid nuclear matter, primarily neutrons.

Assume the radius of a neutron to be approximately 1.0 10^{ - 13} cm, and calculate the density of a neutron. [: For a sphere V = (4/3)r^{3}.]

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