# Special theory of relativity through the Doppler effect

```@article{Moriconi2006SpecialTO,
title={Special theory of relativity through the Doppler effect},
author={M. Moriconi},
journal={European Journal of Physics},
year={2006},
volume={27},
pages={1409 - 1423}
}```
• M. Moriconi
• Published 24 May 2006
• Physics
• European Journal of Physics
We present the special theory of relativity taking the Doppler effect as the starting point, and derive several of its main effects, such as time dilation, length contraction, addition of velocities and the mass–energy relation, and assuming energy and momentum conservation, we discuss how to introduce the 4-momentum in a natural way. We also use the Doppler effect to explain the ‘twin paradox’, and its version on a cylinder. As a by-product we discuss Bell's spaceship paradox, and the Lorentz…
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