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CaptainEvil
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Homework Statement
If a quasar varies on a time scale of four months, how does the maximum size of the emitting region compare with the Schwarzschild radius for a 109 MSun black hole?
Homework Equations
The Attempt at a Solution
Calculating the S radius of the black hole is trivial, but I think I missed the lecture on varying quasars. I don't know of any equations for 'emitting regions' let alone how to use its rotation period to do so. Can anyone start me off on the right track?
fwiw I calculated the S radius by the eqn 3km(M/Msun) = 3 x1012 m