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Nature of Light

15.2. Nature of Light. Electromagnetic waves need no medium, are produced by moving electrons in a field. Can be reflected, refracted, diffracted, produce standing waves. Waves/ particles. Tiny bundles of energy that produce light.

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Nature of Light

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  1. 15.2 Nature of Light

  2. Electromagnetic waves need no medium, are produced by moving electrons in a field. Can be reflected, refracted, diffracted, produce standing waves Waves/ particles

  3. Tiny bundles of energy that produce light. They increase as frequency increases and wavelengths decrease Photons

  4. Sound and Light Atoms Emit Energy As Photons Absorbs Energy

  5. Light is the fastest wave in the universe Speed of light is 300 million m/sec- it takes 8 minutes from sun to earth Speed of Light

  6. Affected by the material that it passes through Transparent- air, water, glass Translucent- frosted glass diffuses light Opaque-light can’t pass through. Speed of Light

  7. “Just Passing Through:” What happens when light strikes glass? Or waxed paper? Or a book? • If light travels through an object it is =transparent • If light is blocked by an object and a dark shadow is cast it is= opaque. • If some light passes through but not all and a light shadow is present it is=translucent. *AIMS:Primarily Physics: Just Passing Through Activity

  8. Quantity of amount of light illuminating a surface, dependant on amount of light. Decreases with distance Intensity of light

  9. Sound and Light Exploring the Electromagnetic Spectrum

  10. Describes physical waves using amplitude, wavelength and frequency. Arranged by Frequency and wavelength Electromagnetic Spectrum

  11. Left side of spectrum has low frequency and large wavelengths, right side has high frequency and close wavelengths Electromagnetic Spectrum

  12. You begin with radio wave, microwaves, infrared, visible light, ultraviolet, x-rays and gamma Electromagnetic Spectrum

  13. Radio- lowest frequency, longest wavelength. Includes AM/FM and radar Radar- Radio Detecting and Ranging Electromagnetic Spectrum

  14. Radar uses short radio impulses to locate and monitor speed once the signal is reflected back. Microwaves follow radio waves and are used in cooking/communication

  15. Infrared- slightly lower wavelength than visible light Felt has heat like in the sun and warming lamps Electromagnetic Spectrum

  16. Visible light – color spectrum ROY G BIV Red, orange, yellow, green, blue, indigo ,violet Electromagnetic Spectrum

  17. The colors are ordered by wavelength. 50% of the sun’s light is visible

  18. Ultraviolet- higher frequency than visible light Kills bacteria, causes cancer, produces vitamin D Electromagnetic Spectrum

  19. X-rays- frequency above ultraviolet waves, passes trough skin but is absorbed by bone, Lead can absorb all X-rays Electromagnetic Spectrum

  20. Gamma rays- has highest frequency and shortest wavelength, has highest energy and can penetrate 3 meters of concrete. Electromagnetic Spectrum

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