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Homework Help: Black hole

  1. Dec 7, 2006 #1
    1. The problem statement, all variables and given/known data
    A black hole has a mass of 2x10^31 kg What is the minimum radius from which a photon can escape its gravity?

    2. Relevant equations

    3. The attempt at a solution

    does this equation give me the answer "gravitational radius" = (2Gm)/c^2
  2. jcsd
  3. Dec 7, 2006 #2
  4. Dec 7, 2006 #3
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