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
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)