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Chapter 18

Chapter 18. The Electromagnetic Spectrum and Light. Chapter 18. *Electromagnetic waves- transverse waves consisting of changing electric fields and changing magnetic fields Electromagnetic waves are produced when an electric charge vibrates or accelerates. Chapter 18.

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Chapter 18

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  1. Chapter 18 The Electromagnetic Spectrum and Light

  2. Chapter 18 • *Electromagnetic waves- transverse waves consisting of changing electric fields and changing magnetic fields • Electromagnetic waves are produced when an electric charge vibrates or accelerates.

  3. Chapter 18 • Electromagnetic waves can travel through a vacuum, or empty space, as well as through matter. • *Electromagnetic radiation- transfer of energy by electromagnetic waves traveling through matter or across space • The speed of light in a vacuum, c, is 3.00 x 108 meters per second.

  4. Chapter 18 • Electromagnetic waves vary in wavelength and frequency. • Electromagnetic radiation behaves sometimes like a wave and sometimes like a stream of particles.

  5. Chapter 18 • Blue light has a higher frequency, and therefore more energy, and will cause the emission of electrons. • Red light, with its lower frequency, won’t cause the emission of electrons.

  6. Chapter 18 • *Intensity- rate at which a wave energy flows through a given unit of area • The intensity of light decreases as photons travel farther from the source.

  7. Chapter 18 • *Electromagnetic spectrum- full range of frequencies of electromagnetic radiation • The electromagnetic spectrum includes radio waves, infrared rays, visible light, ultraviolet light, X-rays, and gamma rays.

  8. Chapter 18 • Radio waves are used in radio and television technologies, as well as in microwave ovens and radar. • Radar- RAdio Detection And Ranging

  9. Chapter 18 • Infrared rays are used as a source of heat and to discover areas of heat differences.

  10. Chapter 18 • People use visible light to see, to help keep them safe, and to communicate with one another. • Ultraviolet rays have applications in health and medicine, and in agriculture. • Vitamin D • Disinfection • Artificial sunlight

  11. Chapter 18 • X-rays are used in medicine, industry, and transportation to make pictures of the inside of solid objects. • Gamma rays are used in the medical field to kill cancer cells and make pictures of the brain, and in industrial situations as an inspection tool.

  12. Chapter 18 • Materials can be transparent, translucent, or opaque. • *Transparent- transmits light • *Translucent- scatters light • *Opaque- absorbs or reflects all light • When light strikes a new medium, the light can be reflected, absorbed, or transmitted. • When light is transmitted, it can be refracted, polarized, or scattered.

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