1. When a certain metal reflects a certain frequency of light, it will kock loose electrons and emit them. Where exactly do these electrons come from? If a metal emits electrons, doesn't that metal eventually gain a positive charge of some sort? Is it possible for piece of metal to lise all of its electrons through the photoelectric effect? 2. Similar to the question above: when electricity is passing through a power cable, does the copper in that cable lose their electrons or just carry them from another source? 3. Question on line emission spectrum: does each line in a spectrum represent an electron releasing a photon from a specific energy level? How can one hydrogen atom release an entire series of lines (i.e. Lyman series) if it only has one electron to emit energy for one specific line? The Lyman series of lines has electrons dropping to ground-states from five different energy levels. Thanks!