text: The equation relating wavelength to frequency is:\n\nL = c / f\n\nwhere L is the wavelength in meters and c is the speed of light in meters per second and f is the frequency in cycles per second (Hz).  L here is technically supposed to be a lambda (the upside-down y-shape, a greek letter) but since I can't type that easily in Y!A I'll just use "L"\n\nThe units are:\nmeters/cycle = (meters/second) / (cycles/second)\n\nSo, L = 3*10^8 / 3*10^4 = 1*10^4 meters (10,000 meters)