1. The problem statement, all variables and given/known data Having done an experiment measuring the intensity of light reflected from copper, lead, zinc and iron, i found that copper reflected the most light, then iron, then zinc, then lead. Now i have to explain it and I dont really know how to ! 3. The attempt at a solution I was thinking perhaps something to do with the fact that each of the metal atoms has different structures, and so different allowed quantum energies with which to absorb and emit light, so thats why they are all different? But then I'm measuring light intensity, and doesn't intensity relate to the number of photons emitted, not the energy of each photon?? I'm really confused! And what about the fact that they are not single atoms, but a lattice, with freely moving electrons? Please help me !