Halliday, Resnick & Walker — Gravitation: Problem Problem_91

Black hole radius, large to small. What is the Schwarzschild radius of (a) the supermassive black hole with \(4.0 \times 10^{10}\) solar masses in the Abell 85 galaxy cluster, (b) the imaged M87 black hole with \(6.4 \times 10^9\) solar masses, (c) an intermediate mass black hole with \(1.0 \times 10^4\) solar masses, (d) the Sun, with mass \(1.99 \times 10^{30} \text{ kg}\), and (e) a micro black hole with a mass of \(2.0 \times 10^{-8} \text{ kg}\)? (The answer to (a) is about the radius of the Solar System. Intermediate mass black holes are rare. Micro black holes were conjectured by Stephen Hawking and might have been produced in the big bang.)