• Most of the galaxies in the universe are observed to be movingaway from Earth. Suppose a particular galaxy emits orange lightwith a frequency of 5.000 * 1014 Hz. If the galaxy is receding fromEarth with a speed of 4375 km>s, what is the frequency of the lightwhen it reaches Earth?

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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.