text: what would be the wavelength of light that has a frquency of 3 x 10 ^4 hz in a vacuum?   the equation relating wavelength to frequency is:  l = c / f  where 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"  the units are: meters/cycle = (meters/second) / (cycles/second)  so, l = 3*10^8 / 3*10^4 = 1*10^4 meters (10,000 meters)