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When deuterium and tritium nuclei fuse to produce helium, what else is produced?
  1. positron
  2. proton
  3. $\alpha$-particle
  4. neutron
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Solution Video

OpenStax College Physics for AP® Courses Solution, Chapter 32, Problem 5 (Test Prep for AP® Courses) (0:25)

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This is College Physics Answers with Shaun Dychko. When deuterium and tritium fuse to produce helium, helium has four sub-atomic particles but there are a total of five nucleons involved in the reaction so that means there must be one more nucleon as a product and that is a neutron. The answer is (d).