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MHT CET Physics question

PhysicsGravitationMHT CET

A black body is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass kg) have to be compressed to be a black hole?

Answer: (C)

Solution

Setting escape speed equal to c: \dfrac{2GM}{c^2}\dfrac{2×6.67×10^{-11}×5.98×10^{24}}{(3×10^8)^2}$≈

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Question ID VK-060064