The speed of light is 3.0 x 10^8 m/s, given the equation c=(x)(v) where v has the unit of s^-1 what is the frequency (v) for the wavelength (x) of 740nm light? For some reason I'm not getting the right units; maybe someone can find my mistake: 3.0 x 10^8 m/s = 740nm(v) 740nm x (1m / 10^9) = 7.4x10^-7 m 3.0 x 10^8m/s = 7.4 x 10^-7 m /7.4 x 10^-7 (3.0 x 10^8m/s) / (7.4 x 10^-7m) = V I seem to be having a problem with my units. Can you have m/s/m ? What exactly does it mean v has the unit of s^-1 ?? Anyone explain?