1. Wavelength and Frequency E = h c =  c = speed of light (3 x 10 8 m/s) = frequency (s -1 )  = wavelength (m) E = energy (Joules or J) h  = Planck’s constant (6.6 x10 -34 J/s) = frequency (s -1 ) f f f f “nu” “lambda”

2. Electromagnetic Spectrum Frequency & wavelength are inversely proportional c = c:speed of light (3.00  10 8 m/s) :wavelength (m, nm, etc.) :frequency (Hz) Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

3. Electromagnetic Spectrum GIVEN: f = ? = 434 nm = 4.34  10 -7 m c = 3.00  10 8 m/s WORK: f = 3.00  10 8 m/s 4.34  10 -7 m f = 6.91  10 14 Hz EX: Find the frequency of a photon with a wavelength of 434 nm. Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem 1 x 10 9 nm 1 m