In the Michelson-Morley experiments two light beams were raced at right angles to each other to detect a possible slight difference in their speeds. What does this experiment show? a. The beam traveling along the direction of the earth's motion always won. b. The beam traveling along the direction of the earth's motion always lost. c. The results depended on the season of the year (i.e., on the direction of earth's motion)" d. A slight speed difference was observed, but declared too small to be taken seriously.

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.