1. The problem statement, all variables and given/known data what type of wave is light and how is light propagated through space? How are these types of waves created, for example, with an oscillator. 2. Relevant equations none 3. The attempt at a solution I have the answer sheet because this is a practice test question. but I don't want to be a machine spitting out what i read and I dont want to blank in the exam. a clear understanding would help me through my future studies I am sure. I understand for this question the answer is that "light is an electromagnetic wave and it is made of an electric field and a perpendicular magnetic field that propagate each other through space." but that just sounds very confusing. I understand that using an oscillator you have the magnetic force from the inductor and the electric force from the capacitor that propagate each other. Maybe the first question was worded weird because the answer seems to be specific what type of light wave is and how it is propagated through the oscillator. For the third question i did quite a lot of research into oscillators and capacitors and inductors reading howstuffworks but still could not understand one main thing. follow this train of thought from howstuff works: "If you charge up the capacitor with a battery and then insert the inductor into the circuit, here's what will happen: The capacitor will start to discharge through the inductor. As it does, the inductor will create a magnetic field. Once the capacitor discharges, the inductor will try to keep the current in the circuit moving, so it will charge up the other plate of the capacitor. Once the inductor's field collapses, the capacitor has been recharged (but with the opposite polarity), so it discharges again through the inductor." what does the bold part mean?????????? I am so confused as to why that would ever happen. how and why does the polarity switch? why doe the inductor charge the other plate of the capacitor. aside from this it mostly makes sense to me.