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The speed of light is a fundamental universal constant that marks the maximum speed at which energy and information can propagate. Its value is $299792458\frac{\mathrm{m}}{\mathrm{s}}$.

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In Special relativity why the light clock is orthogonal to the direction of motion of the tr...

I tried to see if this question has been asked elsewhere in the forum, I couldn't find it, unless somehow I missed it. I have always wondered why the light clock in the relativity train goes up and do …
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