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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]

(a)  (2Gm/r)1/2≤c               (b) (2Gm/r)1/2=c

(c) (2Gm/r)1/2≥c                 (d) (gm/r)1/2≥c

Answer: c

(4)

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