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Question
When a $\pi^-$ decays, the products may include:
  1. A positron
  2. A muon
  3. A proton
  4. All of the above
Question by OpenStax is licensed under CC BY 4.0.
Final Answer
(b)
Solution Video

OpenStax College Physics Solution, Chapter 33, Problem 15 (Test Prep for AP® Courses) (0:36)

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Video Transcript

This is College Physics Answers with Shaun Dychko. When a negative pion decays, the products have to include something that has a negative charge in order for charge conservation to apply and charge conservation is one of these strong conservation or exact conservation rules; exact meaning there are no exceptions to it. So if this negative thing decays, it has to produce a negative thing and so that means a muon, which is negatively charged could be one of the products.