Hey, In an X-ray tube, you know how there is the target where the electrons collide and stuff... and you know how there is the tungsten part and the the copper bit (the tungsten being the one which electrons collide on)... well my book discusses them separately and i am just a bit confused: 1) Are they both anodes? I.e. both are the positive terminal? 2) Which one is referred to as the target? - Is it both or just the tungsten insert? 3) Why is it called the tungsten INSERT? Do we insert it in there or something? 4) Why are they separated? Why cant we just have it all tungsten or all copper? Thanks EDIT: 5) Also, why does a lot of heat get generated at the anode? My guess would be because the electrons are hitting the anode... but why does it generate heat when it hits? Why cant all the energy be converted into X-rays? - Apparently over 98% of the energy of the electrons is converted to heat! WHY?