Wavelength of X-ray E Wavelength,入 E,=E,sin2x(经W k H Wavelength,入 5 g ultraviolet shortwave gamma X-rays rays infrared radar FMTV AM rays rays 10-4 10-2 10一109 10-6 0、021 102 104 Wavelength (meters) Visible Light 400 500 600 700 Wavelength(nanometers)Wavelength of X-ray E E  x t x,t  0 sin 2     H H  x t x,t  0 sin 2     sin 2 ( ) , 0 vt x E x t  E   