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Which phenomenon is shown in the figure?

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Which phenomenon is shown in the figure?

(a) Pair Production

(b) Photoelectric Effect

(c) Compton effect

(d) Pair annihilation

I have been asked this question during an interview.

My doubt is from Pair Productions topic in division Quantum Physics of Engineering Physics I

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Correct choice is (d) Pair annihilation

The explanation: In the figure, an electron and a positron annihilate each other and release the equivalent amount of energy. This process is called Pair annihilation. It is just the opposite of pair production.

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