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According to Stephen Hawking, owing to which process, can the particles escape the field of black hole?

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According to Stephen Hawking, owing to which process, can the particles escape the field of black hole?

(a) Pair production

(b) Pair annihilation

(c) Compton effect

(d) Photoelectric effect

The question was posed to me by my college director while I was bunking the class.

This key question is from Dying Stars in section Quantum Physics of Engineering Physics I

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The correct answer is (a) Pair production

Easy explanation: According to quantum mechanics, the two particles in a pair may sometimes be wrenched apart before they have a chance to mutually annihilate. When this happens in the region around a black hole, one particle may escape while its antiparticle partner is captured by the black hole.

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