Popular Science

the name for the change in sound as waves from the source move closer or farther away from you, elongating as they move away and shortening as they come closer. Visible light, as seen in the colors of the rainbow, exhibits similar properties, with longer wavelengths appearing as a red shift and shorter wavelengths as a blue shift.

Einstein’s declaration of wave-particle duality earned him the Nobel Prize in physics in 1921.

Since Einstein’s discovery, physicists have embraced this theory. Einstein declared: “We have two contradictory pictures of reality; separately neither of them fully explains the phenomena of light, but together they do.”