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11 Dec 2019

X-ray pulses from Cygnus X-1m 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 3.61ms. If the blob were in a circular orbit about a black hole whose mass is 13.5 times the mass of the Sun, what is the orbit radius? The value of the gravitational constant is 6.67259 X 10^-11N.m2/kg2 and mass of the Sun is 1.991 X 10^30kg. Answer in units of km

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