Question

The red shift of light from distant galaxies provides evidence that these galaxies are A.) decreasing in size B.) increasing in size C.) decreasing in distance from the earth D.) increasing in distance from the earth

Answer 1

Answer: D.) increasing in distance from the earth

Explanation:

The Doppler shift is related to the Doppler effect and refers to the change in a wave perceived frequency (or wavelength=color) when the emitter of the waves, and the observer move relative to each other.

From there, it is deduced that the farther the object is, the more redshifted it is in its spectrum. For example, as a galaxy moves away from the Earth, its espectrum turns towards the red and as the galaxy moves toward the Earth, its espectrum turns towards the blue.

It should be noted that this effect bears its name in honor of the Austrian physicist Christian Andreas Doppler, who in 1842 proposed the existence of this effect for the case of light in the stars.