Can someone tell me if these statements are right/wrong, and if wrong, why they are wrong? Lets say you have a light (or more generally, EM) source a distance r from a black hole's core, with r > event horizon radius. As you move closer towards the black hole, since the energy of a photon = hf, with h = constant, and the gravitational PE varies as 1/r...therefore the frequency fall due to red shifting falls as 1/r as well. I get this equation relating the frequencies at 2 points and the radius from the black hole: (f1 - f2)/(f1 + f2) = GM(1/r1 - 1/r2) If the above are true, then the event horizon for different frequencies of light varies. High frequency EM radiation will have a larger event horizon than low frequency EM radiation. AFAIK, the event horizon is a fixed distance for light... Am I looking at the problem too "classically"?