Electromagnetic Spectrum AM Shortwave TV FM Radar & microwaves Infrared Rays Ultraviolet Rays X-rays Gamma Rays 104 m 102 m 1 m 10-2 m 10-4 m 10-6 m 10-8 m 10-10 m 10-12 m 10-14 m Increasing Wavelength Increasing Frequency Visible Spectrum ROY G BIV

E = h   h = Planck’s Constant h = 6.626  10-34 Js Light and Energy The energy of light depends on its frequency/wavelength: Max Plank 1858 - 1947 h = Planck’s Constant h = 6.626  10-34 Js (Know this number!)

Electromagnetic Spectrum AM Shortwave TV FM Radar & microwaves Infrared Rays Ultraviolet Rays X-rays Gamma Rays 104 m 102 m 1 m 10-2 m 10-4 m 10-6 m 10-8 m 10-10 m 10-12 m 10-14 m Increasing Wavelength Increasing Frequency Increasing Energy E = h Visible Spectrum ROY G BIV

Energy Comparison EFM < Egreen light Visible green light:  = 6.0  1014 Hz E = h E = 6.626  10-34 Js  (6.0  1014 1/s) E = 4.0  10-19 J EFM < Egreen light FM Radio:  = 94.5  106 Hz E = h E = 6.626  10-34 Js  (94.5  106 1/s) E = 6.63  10-26 J