A hole is black because the light that enters has to reflect off the surface of the hole so many times that it is mostly absorbed. I thought that was a cool fact.
Adrias I don't think what you say about quantisation of a photon of energy is correct. When electrons become excited, they had to absorb a photon with energy equal exactly to the energy they gained. When the electrons return to the ground state, they release a photon with the same energy as the incoming photon. So why something appears black doesn't fit with you're explanation.
Another thing you said was that it is wrong to say that there is always a little bit of visible light. I think that there will always be a little bit of visible light, even if you had a totally dark room with no light source. This is because all objects emit electromagnetic radiation as their vibrating atoms are accelerating charge. This phenomena can be seen when a hot object glows, because the greater temperature results in the atoms vibrating faster. However, even at low temperatures, there should be some visible light emitted. Even if the intensity is too low for our eyes to register, there would be some visible light.
http://en.wikipedia.org/wiki/Black_body_radiationI don’t know if visible light can pass through all objects. Even though an electron can’t absorb and emit light unless its of correct energy, what about the atom itself? Even if the energy of an atom is restricted to multiples of h (h being plank's constant), as the photons themselves will have energy equal to a multiple of h (E=hf), they can all be potentially absorbed. I don’t think you can say that because most of an atom is mostly ‘space’, its unlikely light will be able to interact with an electron or atom. This is because there would be so many atoms in a small piece of material, so even if the probability of it being absorbed by a single atom is small, the probability of it being absorbed by the material will be much greater. Also, electrons won’t be simple billiard balls circling the nucleus with a neat path but occupy a much larger space over time. Even in transparent objects the atoms absorb the light (but re-radiates it).That is why light effectively travels slower in a material and why we get refraction.
http://en.wikipedia.org/wiki/Atomic_orbitalAnyway, I don't think I'm making a point at all but I think Physics is confusing and annoying and people who think they get it don’t really get it so we should all stick to drawing. Post your idea on "ask a scientist" for an expert opinion on you’re statements.
http://www.madsci.org/
