c = speed of light = 3 x 1010 cm/sec = 3 x 108 m/sec h = Planck's constant = 6.626 x 10-34 J/sec
c = wavelength x frequency
energy of a photon = h x frequency
nano means "billionth": 1 nm = 1 x 10-9 m OR 1 x 109 nm = 1 m mega means "million": 1 x 106 Hz = 1 MHz Frequency refers to the number of waves that pass by each second and is measured in a unit called Hertz (Hz).