Certain Stars at the End of Their Lives Are Thought

Multiple Choice

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 × 10³⁰ kg collapsed into neutrons (m_n = 1.67 × 10−²⁷ kg) ,what would be the radius of such a star? (Hint: r = r₀A^1/3,where r₀ = 1.20 × 10−¹⁵ m. )

A) 12.7 km
B) 25.4 km
C) 16.1 km
D) 18.5 km