December 7, 2013
The image we often see of photons as a tiny bit of light circling a black hole in well defined orbit of radius r=3GM/C2 (where G = Newton’s universal constant of gravitation, C = speed of light in vacuum and M = mass of the black hole) is actually quite interesting. The photon must satisfy the condition r= ħ/mC (where m = mass of the photon and ħ = reduced Planck constant) much like an electron moving in a circular orbit. Since this condition forces the photon to orbit the hole in a circular orbit.
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