AIPMT | 2014GravitationHard
Question
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?
Options
A.10-9 m
B.10-6 m
C.10-2 m
D.100 m
Solution
Ve = 
= C
⇒ R =
=
× 10-3m
= 8.86 × 10-3 ≈ 10-2m
= C⇒ R =
=
× 10-3m= 8.86 × 10-3 ≈ 10-2m
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