In the way I was taught about special relativity, time dilation is like the fundamental building block from which you derive things like relativistic mass and length contraction.(adsbygoogle = window.adsbygoogle || []).push({});

So it has always struck me as quite odd, that the derivation of time dilation (in some sense the basis of special relativity) uses something as abstract as light bouncing up and down in a box to measure time.

Something that has never been built in reality to my knowlege.

I don't have any problems with this proof.It is very elegant and simple.

Yet there rarely is just one nice derivation or proof for such things

and I have never seen any alternetative for this case.

Have you ?

Is there a way to derive it by considering some other process ? :)

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# B Derivation of time dilation without light clocks

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