Hey all I was just wondering if anyone knows how to figure out these two questions. 1) The difference in potential between the cathode and the anode of a spark plug is 1.0x10^4V. What energy does an electron give up as it passes between the electrodes? This one I am really pretty clueless. 2) Television channel 6 broadcasts on a frequency of 85MHz. What is the wavelength of the electromagnetic wave broadcast on channel 6? What is the length of an antenna that will detect channel 6 most easily? I read somewhere that to figure out radio wave length you take the megahertz and divide it into 300. Which works out to 3.5. I am not sure if this is the correct way to do it seems sort of simple. If anyone could give any help would be appreciated also any sites where I can better learn the material being used would be great. Thanks.