Question

# A neutron star has a density equal to that of the nuclear matter. Assuming the star to be spherical, find the radius of a neutron star whose mass is 4.0 ×1030 kg (twice the mass of the sun).

Solution

## We know f=MV ⇒V=Mf=4×10302.4×1017 =10.6×1013 =16×1014 V=43πR3 ⇒16×1014=43×π×R3 ⇒R3=16×34×1π×1014 ⇒R3=18×100π×1012 ∴R=12×104×3.17 =1.585×104=15km

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