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The condition for a uniform spherical mass m of radius r to be a black hole is [G= gravitational constant and g= acceleration due to gravity]                        [AIIMS 2005]

A.             \[{{(2Gm/r)}^{1/2}}\le c\]
B.               \[{{(2Gm/r)}^{1/2}}=c\]
C.             \[{{(2Gm/r)}^{1/2}}\ge c\]
D.               \[{{(gm/r)}^{1/2}}\ge c\]
Answer» D.               \[{{(gm/r)}^{1/2}}\ge c\]


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