The figure below illustrates pair production in the early universe, with one particle labeled with a question mark. What type of particle must this be?

Name: The figure below illustrates pair production in the early universe, with one particle labeled with a question mark. What type of particle must this be?
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Question

The figure below illustrates pair production in the early universe, with one particle labeled with a question mark.  What type of particle must this be?

Quizplus · Accepted Answer

Pair production involves the creation of a particle and its antiparticle, typically an electron and a positron. Therefore, the particle labeled with a question mark must be a positron (choice D).

The Figure Below Illustrates Pair Production in the Early Universe