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21-06-2017
Physics

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Einstein’s postulate that concerns the speed of light is that rulers and clocks cannot be used to measure the speed of light nothing can travel faster than the speed of light all uniformly moving observers measure the same speed of light the speed of light is defined as 3 E8 m/s

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04-07-2017

I believe the correct answer would be the last option. Einstein’s postulate that concerns the speed of light is that the speed of light is defined as 3x10^8 m/s. For him, the speed of light is independent of the observer's speed and the source's speed so it has a constant value.

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