General Astronomy - Spring
2006
Homework #10 - due April 24
1. What is the Schwarzschild radius of a 3,000,000
solar mass black hole?
2. What is the maximum possible amount of energy which could be
released by dropping 1 kg of hydrogen gas onto a maximally rotating
black hole? How long would this energy power the US?
3. A black hole is observed at a luminosity of 1033 W.
What does this tell us about the black hole mass?
4. Calculate the peak temperature of the blackbody radiation from a 100
solar mass black hole radiating at the Eddington luminosity.
5. The
brightness of a quasar varies by a factor of 10 over 2 days. What
does this tell us about the quasar?