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Question: 

What are the wavelengths of the two photons produced when a proton and antiproton at rest annihilate?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$1.32 \times 10^{-15} \textrm{ m}$

Giancoli 7th Edition, Chapter 32, Problem 19

(2:18)

Chapter 32, Problem 19 is solved.

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