Question

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

• A. $\left[ \frac { 2 \mathrm { GM } } { \mathrm { r } } \right] ^ { 1 / 2 } \leq \mathrm { c }$
• B.
• C. $\left[ \frac { 2 \mathrm { GM } } { \mathrm { r } } \right] ^ { 1 / 2 } \geq \mathrm { c }$
• D.

Answer 1

Answer: (C)

$\left[ \frac { 2 \mathrm { GM } } { \mathrm { r } } \right] ^ { 1 / 2 } \geq \mathrm { c }$

Answer 2

$\left[ \frac { 2 \mathrm { GM } } { \mathrm { r } } \right] ^ { 1 / 2 } \geq \mathrm { c }$