The Sound of a Black Hole Astronomers 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-flat below the B-flat given, in Table 14-3. How long does it take for this sound wave to complete one cycle? Give your answer in years.
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