Frequency in Wavelength cycles per second in nm 106 m 400- 1020 Gamma rays Violet One angstrom 10- 450 Indigo One nanometer Blue X-rays 500- Ultraviolex Green 105 One micrometer Visible Light Yellow 104 Infrared Orange 人无令 One centimeter Red 100- Mobile Short radio waves phone One meter Short radio waves 109 Broadeast band One kilometer 105 Visible Light:X~6000 A 10 Long radio waves X-rays: λ0.5-2.5A Electrons: 元~0.05A6 Mobile phone