The Sound of a Black HoleAstronomers using the Chandra
Chapter 14, Problem 111(choose chapter or problem)
The Sound of a Black HoleAstronomers using the Chandra X-ray Observatory have discovered that the Perseus Black Hole, some 250 million light years away, produces sound waves in the gaseous halo that surrounds it. The frequency of this sound is the same as the frequency of the 59th B-at below the B-at given in Table 143. How long does it take for this sound wave to complete one cycle? Give your answer in years.
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