Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    cheers.....................
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook