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Physics, 23.09.2019 19:30 dondre54

Which of the following is true about the speed of light?
a - it is a constant when the light is traveling in a vacuum.
b - it speeds up or slows down depending on the observer.
c - it is slowest in a vacuum.
d - it varies depending on the color of the light.

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Which of the following is true about the speed of light?
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