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Light

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Light

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    1. Light I. Electromagnetic Radiation EM Radiation EM Spectrum Types of EM Radiation

    2. A. EM Radiation Electromagnetic Radiation transverse waves produced by the motion of electrically charged particles does not require a medium speed in a vacuum = 300,000 km/s electric and magnetic components are perpendicular

    3. A. EM Radiation Photons tiny, particle-like bundles of radiation absorbed and released by electrons

    4. B. EM Spectrum

    5. C. Types of EM Radiation Radiowaves lowest energy EM radiation

    6. C. Types of EM Radiation Radiowaves FM - frequency modulation AM - amplitude modulation

    7. C. Types of EM Radiation Infrared Radiation (IR) slightly lower energy than visible light can raise the thermal energy of objects thermogram - image made by detecting IR radiation

    8. C. Types of EM Radiation Visible Light small part of the spectrum we can see ROY G. BIV - colors in order of increasing energy

    9. C. Types of EM Radiation Ultraviolet Radiation (UV) slightly higher energy than visible light Types: UVA - tanning, wrinkles UVB - sunburn, cancer UVC - most harmful, sterilization

    10. C. Types of EM Radiation Ultraviolet Radiation (UV) Ozone layer depletion = UV exposure!

    11. C. Types of EM Radiation X rays higher energy than UV can penetrate soft tissue, but not bones

    12. C. Types of EM Radiation Gamma rays highest energy EM radiation emitted by radioactive atoms used to kill cancerous cells

    13. Seeing Light Something that produces its own light is called a luminous object. Objects that reflect light waves are called illuminated objects.

    14. Reflection Regular (or specular) reflection when all light waves reflect in the same direction. Law of reflection Diffuse reflection light waves reflect, but are scattered in many directions. Retro-reflective light is bounced straight back!

    15. Reflection Incident beam incoming light ray Reflected beam outgoing light ray Normal line perpendicular, measure all angles from this line.

    16. Law of Reflection The angle of incoming light (angle of incidence) is equal to the angle of reflected light (angle of reflection).

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