This document contains comments about the article "Compton_scattering" in Wikipedia
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In the last paragraph I explain my own opinion.

### Introduction

The article starts with the following sentence.

### 1. Introduction

The effect is significant because it demonstrates that light cannot be explained purely as a wave phenomenon.
The effect implies that light has energy, and should be treated as such. IMO implying that light has mass.

### 2.1 Derivation of the scattering formula

Before the scattering event, the electron is treated as sufficiently close to being at rest that its total energy consists entirely of the mass-energy equivalence of its rest mass me:
Ee = me*c^2.
This is a very strange formula. IMO you can only use this formula when a particle has the speed of light.
IMO the following formula makes more sense:
Ee = me0*c^2 = me*v^2
After scattering, the possibility that the electron might be accelerated to a significant fraction of the speed of light, requires that its total energy be represented using the relativistic energy–momentum relation:
Ee' = sqrt { (pe'*c)^2 + (me*c^2)^2 }.
IMO in some sense you should always use such type of equation to explain each type of collision. The reverse can also happen.

### 3.3 Inverse Compton scattering

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Created: 2 February 2017

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