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A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = 5.98 × 1024 kg) have to be compressed to be a black hole?
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- 10–9 m
- 10–6 m
- 10–2 m
- 100 m
Correct Option: C
From question, Escape velocity = √2GM / R = c = speed of light
| ⇒ R = | ||
| c2 |
| = | = 10-2 m | |
| (3 × 108)2 |
