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Kaylah Ward ∙
There isn't any. The skinniest trace of light, so weak that the human eye can't
detect it, and the mightiest torrent of light from an exploding star, all travel at
the same speed, as long as the comparison is made in the same material.
Likewise, light with the lowest frequency/longest wavelength and light with the
highest frequency/shortest wavelength ... the properties that really determine the
energy carried by the light ... all have the same speed, as long as the comparison
is made in the same material.
Ultraviolet waves
4.78 x 10-19