1. A photon that emerges when an electron jumps one orbital down -- will have a fixed energy ...i.e. the different between the (potential) energy of the orbitals. However a "free/unbound" photon can have any energy level. Is that correct? 2. What is the lowest level of energy a "unbound" photon can have? 3. During a process of entanglement say when a photon A strikes a special kind of crystal we have two photons (in say 1 in a trillion tries) Photon B and Photon C emerge as entangled. The energy of photon B and C is equal to that of photon A. Now if we take photon B and have it strike another crystal .....we have photon D and E emerge with half of the energy of Photon B. 4 a ) however Photon D and E would never be entangled with photon C because entanglement between B and C would have broken when B was destroyed (?) 4 b) how long can we keep repeating the process where we are "breaking" a bigger photon into smaller photons.....of say half the energy? is there a lower bound for the energy of the photon? 5. When an electrons jumps one orbital down does it disappear from the higher energy orbital and simultaneously appear at the next lower level orbital OR can we actually observe/measure it travelling (in time-space) between orbitals? 6. What is the effect on entropy during the process of entanglement?