How is Einstein’s theory of relativity responsible for the color of gold?

The attractive metal gold in its actual form is golden in color while silver, aluminum, tin, nickel etc are silvery in color. Einstein’s theory of relativity is directly responsible for the golden appearance of gold. Sounds strange?

Here’s an explanation: Normally in majority of elements, the electrons move around the nucleus at the speed of 200 kilometers per second which is hardly 0.07% of the speed of light. Gold having high density attracts high electric charge and thus the electrons move, around its nucleus, at comparatively higher speed. According to Einstein’s theory of relativity, the time slows down for the fast moving electrons, and they refract the light rays of different wavelength giving the gold a ‘golden’ appearance.

More reading:
Gold (Wikipedia)

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