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I'm just curious, is there a way to calculate the speed of light in a gravitational field? From my understanding, light travels slower in a gravitational field and the speed is zero in a black hole. Is there an equation to determine the speed of light on earth (not including slowing down due to air) compared to the speed of light in a vacuum? The closest I could find was this which says that c'=co(1 + V/c^2) where V is the potential energy - GMm/r At the schwarzschild radius, r=2GM/c^2, the speed of light would be 0.5c. However, we know that the speed of light in a black hole is zero. Am I missing something here?

For question 4 (about aromaticity) try drawing some resonance structures...then you should hopefully be able to figure it out

Thanks for your response. I was always told that the two were incompatible (ie that if one is correct, the other must not be entirely correct), but I guess that's not true? The only problem is that we can not explain gravity with either theory? Other than that, the two theories are not incompatible?

Why are Quantum & Relativity theories incompatible? I don't see why they can't both be true, and I would like to have a discussion. Can anyone provide a (relatively) simple example where the two are at odds? Thanks.