Question

(2.) The radius of a black hole, where light cannot escape, is the A) spherical radius B) singularity radius C) light radius D) Schwarzschild radius E) Einstein radius

Answer 1

D) Schwarzschild radius

Step-by-step explanation:

The part of the black hole from which light cannot escape is called the event horizon

The event horizon of a black hole is determined by the Schwarzschild radius. It is given by

`r_s=(2GM)/(c^2)`

Where

G = Gravitational constant = 6.674×10⁻¹¹ m³/kg⋅s²

M = Mass of the object

c = Speed of light = 3×10⁸ m/s

The singularity is a point where the gravitational field becomes infinite. Center of the black hole is a point of singularity.

An Einstein ring's radius is called Einstein radius.