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Question: 

What would be the wavelengths of the two photons produced when an electron and a positron, each with 420 keV of kinetic energy, annihilate in a head-on collision?

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

Quick Answer: 

$1.3 \times 10^{-12} \textrm{ m}$

Giancoli 7th Edition, Chapter 32, Problem 21

(2:47)

Chapter 32, Problem 21 is solved.

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