The condition for a uniform spherical mass $m$ of radius $r$ to be a black hole is [$G=$ gravitational constant and $c=$ speed of light]
- A$(2Gm/r)^{1/2} \le c$
- B$(2Gm/r)^{1/2} = c$
- C$(2Gm/r)^{1/2} \ge c$
- D$(Gm/r)^{1/2} \ge c$
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