Hi there, I've got a few questions about light that I'm hoping someone can help me with. 1. If the properties of energy and mass are interchangeable, then if some particle or wave possesses charge or energy then it must also have mass. Whether a photon is acting as a particle or a wave it still posseses energy, thus mass, and so should not be able to attain a speed of c. I have read an answer to a similar question where the answer stated that possesing mass is not a prequisite to physical existence, but I disagree with that statement, for to exist, a force must possess a physical pressence in the form of an energy in order to cause an affect upon other matter. How can you explain this contradiction of light's properties? Could it be that the size/mass and properties of the photon are at an exact, compramising point and state required for matter and the speed of c to be able to co exist as one? 2. What does it mean when an electron is said to move to a higher energy orbit? (Unfortunately I'm not a mathmatition, I'm good with processes, but I need answers in lamens terms). I've read, that, as the atom is energised, eg elctricity in a light bulb etc. the electron becomes temporarily energised, and so moves to a higher energy orbit. Now it cant sustain that orbit, and when it drops back to its preferable, lower energy orbit, that difference in energy is released in the form of a packet of energy; a photon. What I want to know, is what is physically happening when the electron becomes energised and moves to a higher energy orbit? How is the electron able to possess more energy? for it can't move any faster as it is already aproaching the speed of c anyway. Does the Electron therefore possess a greater charge and increase its size while it is said to move to a higher energy orbit? Could it be possible, that as the electron becomes energised, it does infact move at an increased speed, which would cause it to move at, or faster than the speed of c. Perhaps in order to prevent this 'breaking of the rules' The paradox created by it achieving what it should be un able to, is what creates the photon, in order to reset the energys and speeds back down to what they should be. This last point is meerly the entertaining of a fancy of mine. Although there is logic behind this fancy, my post is already too long, and adding this reasoning right now would make it a bit too sizeable.