Certain stars at the end of their lives are thought to collapse, combining their protons and electrons together to form a neutron star. Such a star could be thought of as a giant atomic nucleus. If a star of mass equal to M = 4.00 × 10^30 kg collapsed into neutrons (mn = 1.67 × 10^-27 kg), what would be the radius of such a star? (Hint: r = r0A1/3, where r0 = 1.20 × 10^-15 m.)
a. 12.7 km
c. 16.1 km
b. 25.4 km
d. 18.5 km
C
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