X-ray pulses from Cygnus X-1, the first black hole to be
Chapter 13, Problem 71(choose chapter or problem)
X-ray pulses from Cygnus X-1, the first black hole to be identified and a celestial x-ray source, have been recorded during high-altitude rocket flights. The signals can be interpreted as originating when a blob of ionized matter orbits a black hole with a period of 5.0 ms. If the blob is in a circular orbit about a black hole whose mass is 20MSun, what is the orbit radius?
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