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 x J/s) = frequency (s -1 ) f f f f “nu” “lambda”
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
Electromagnetic Spectrum GIVEN: f = ? = 434 nm = 4.34 m c = 3.00 10 8 m/s WORK: f = 3.00 10 8 m/s 4.34 m f = 6.91 Hz EX: Find the frequency of a photon with a wavelength of 434 nm. Courtesy Christy Johannesson 1 x 10 9 nm 1 m