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

Options

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

C

Explanation

`v_e=sqrt((2GM)/R`, If `v_egeC` (speed of light)
Planet behaves as black hole.