Q. 20

Expert-verifiedFound in: Page 354

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

Nothing can escape the event horizon of a black hole, not even light. You can think of the event horizon as being the distance from a black hole at which the escape speed is the speed of light, making all escape impossible. What is the radius of the event horizon for a black hole with a mass times the mass of the sun? This distance is called the Schwarzschild radius.

The radius of the event horizon of the black hole is

Mass of black hole = times of the mass of the sun, escape velocity =

We know, escape velocity :

Substituting the values of G, M, v in the above equation, and solving for R we get :

The radius of the event horizon for the black hole is

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