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The Nature of Light

The Nature of Light. Lesson 1. Approved for Public Release: NG17-1826, 9/15/17. What we know about light. Light travels in a straight line as it moves away from the source. Light travels very fast. (186,000 miles/second). http://www.pbs.org/wgbh/nova/space/petters-physics.html.

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The Nature of Light

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  1. The Nature of Light Lesson 1 Approved for Public Release: NG17-1826, 9/15/17

  2. What we know about light • Light travels in a straight line as it moves away from the source. • Light travels very fast. (186,000 miles/second) http://www.pbs.org/wgbh/nova/space/petters-physics.html Approved for Public Release: NG17-1826, 9/15/17

  3. White light is made up of many colors • Light changes direction (refracts) when it encounters a different medium. • When light passes through a prism, it is separated into its spectrum (ROYGBIV). http://spaceplace.nasa.gov/blue-sky/en/sky5.en.png Approved for Public Release: NG17-1826, 9/15/17

  4. What is light? • Light is made up of tiny packets of energy known as photons. • These photons travel as waves. http://study.com/cimages/multimages/16/photonpar.jpg Approved for Public Release: NG17-1826, 9/15/17

  5. What are the parts of a wave? • The top part of the wave is known as the crest. • The bottom of the wave is known as the trough. • The distance between two crests is known as a wavelength. http://science.hq.nasa.gov/kids/imagers/ems/wave_crest.gif Approved for Public Release: NG17-1826, 9/15/17

  6. What is frequency? • The frequency of a wave is defined as the number of wavelengths that pass a certain point in one second. • What is the frequency of this wave? Approved for Public Release: NG17-1826, 9/15/17

  7. Explore the relationship between wavelength and frequency Copy and paste this address into your web browser to load the simulation: https://phet.colorado.edu/sims/html/wave-on-a-string/latest/wave-on-a-string_en.html Approved for Public Release: NG17-1826, 9/15/17

  8. How are the colors of light different from each other? • Each color of light is made up of photons with different wavelengths and frequencies. Using this information: Explain why light separates into its spectrum when it passes through a prism. http://imagine.gsfc.nasa.gov/educators/lessons/roygbiv/ Approved for Public Release: NG17-1826, 9/15/17

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