Chemistry 12th Edition

Unit of wavelength is meter (m). Unit of frequency is Hertz named after Heinrich Rudolf Hertz and defined as one cycle per second. 1 Hz = 1/s Speed of light in meters per second is 3 x $10^{8} m/s$ Speed of light in miles per hour is 670,616,629 miles per hour or 6.7 x $10^{8}$ mph