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Electromagnetic Spectrum and Colors

Electromagnetic Spectrum and Colors. The EM Spectrum. Speed of all electromagnetic waves is constant = speed of light High Frequency = Small Wavelength = High Energy Gamma Rays Low Frequency = Large Wavelength = Low Energy Radio Waves. Energy. Radio Waves. Wavelengths

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Electromagnetic Spectrum and Colors

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  1. Electromagnetic Spectrum and Colors

  2. The EM Spectrum

  3. Speed of all electromagnetic waves is constant = speed of light High Frequency = Small Wavelength = High Energy Gamma Rays Low Frequency = Large Wavelength = Low Energy Radio Waves

  4. Energy

  5. Radio Waves • Wavelengths • Football Field to 30 cm • Sources • Stars • Transmitters • Uses • AM Radio = Amplitude Modulation • FM Radio = Frequency Modulation • Television • Cell phones • Radar

  6. Energy

  7. Microwaves • Wavelengths • 30 cm to 1 mm • Sources • Stars • Magnetron • Uses • In microwave ovens • Cell phones • Wi-Fi • Radar

  8. Energy

  9. Infrared Waves • Wavelengths • 1 mm to 700 nm • Sources • Stars • Organisms • Heat Sources • Uses • Night Vision • Thermal Imaging • Remote Controls

  10. Energy

  11. R O Y G. B I V red orange yellow green blue indigo violet Visible Light • Region of the EM spectrum that the human eye can detect • All the colors (ROYGBIV - this is order of colors in increasing energy / decreasing wavelength / increasing frequency) • Wavelengths • 700 nm to 400 nm • Sources • Stars • Light Bulbs • Lasers • Uses • Sight • Communication

  12. Energy

  13. Ultraviolet Waves • Wavelengths • 400 nm to 60 nm • Sources • Stars • Black Lights (UVA) • Mercury-Vapor Lamps (UVB and UVC) • Uses • Sterilization • Security • Forensics • Chemical Markers • UVA = tanning, wrinkles • UVB = tanning, sunburn, cancer • UVC = used for sterilization, most dangerous

  14. Energy

  15. X-Rays • Wavelengths • 60 nm to 0.0001 nm • Sources • Stars • X-Ray Tubes • Uses • Medical Imaging • Security • Astronomy • Can penetrate soft tissue, but not bone

  16. Energy

  17. Radiation treatment using radioactive cobalt-60. Gamma Rays • Wavelengths • 0.1 nm to 0.00001 nm • Sources • Radioactive atoms (radioactive waste from nuclear fission plants releases gamma rays) • Stars • Uses • Cancer radiation treatments

  18. Light and Color • Opaque • Absorbs or reflects all light (can’t see through it) • Translucent • Allows some light to pass through it • Transparent • Allows light to pass through completely

  19. Additive Color • White light • contains all visible colors - ROYGBIV • In white light, an object… • reflects the color you see • absorbs all other colors • Primary Additive Colors • Red • Green • Blue • Examples • Computer Monitors (kinda) • Televisions (kinda)

  20. Subtractive Color • Pigments, Dyes, Inks, Paints • colored material that absorbs and reflects different colors • Primary Subtractive Colors • Magenta • Cyan • Yellow • Examples • Color Ink Cartridges

  21. Negative Afterimage - One set of cones gets tired, and the remaining cones produce an image in the complimentary color.

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