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Conceptual Physics

Conceptual Physics. Notes on Chapter 27 Light. Light. Early Concepts of Light Up until the time of Newton, most scientists thought that light was a particle. Dutch scientist Christian Huygens said light was a wave. Then in 1905, Einstein said light was

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Conceptual Physics

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  1. Conceptual Physics Notes on Chapter 27 Light

  2. Light Early Concepts of Light Up until the time of Newton, most scientists thought that light was a particle. Dutch scientist Christian Huygens said light was a wave. Then in 1905, Einstein said light was small particles - massless bundles of energy that behaved like waves called photons.

  3. Light Speed of Light In 1675, a Danish astronomer named Olaus Roemer demonstrated that light travels as a finite speed Roemer’s Experiment pg. 405 • Dutch scientist Huygens looked at Roemer’s data and calculated the speed of light to be 300,000 km/s.

  4. Light • In 1880, an American scientist named Albert Michelson performed a experiment using a spinning mirror to find the speed of light. Michelson’s Experiment

  5. Light

  6. Light • Michelson speed for light (the excepted value today) is 299,920 km/s. NOTE: We will use Roemer’s rounded number of 300,000 km/s.

  7. Light FUN FACTS • Light would travel 7.5 times around Earth in one second. • Light takes 8 minutes to travel from the Sun to Earth - a distance of 93,000,000 miles. • Traveling at the speed of light, it would take 4 yrs to travel to the nearest star.

  8. Light Electromagnetic Waves • Electromagnetic Spectrum is a continuous range of waves extending from the longest (Radio) and going to the shortest (Gamma).

  9. Light • Any material that allows light to pass through in straight lines is said to be transparent. • EX: Glass Water • Any material that absorbs light w/o reemission is said to be opaque. • EX: Wood Stone

  10. Light SHADOWS • A thin beam of light is called a Ray. When light rays can not go past an object, a shadow is formed. Two parts of a shadow are: • umbra: a total shadow. • penumbra: a partial shadow. • EX: Solar and Lunar Eclipses • See pg. 413 Fig. 27.12 & 27.13

  11. Light POLARIZATION • Light is a transverse wave. White light is Non-polarized. • When passed through a filter (Polarizer) only light that is moving same as the filter opening will make it through. • See pg. 415 Fig. 27.18

  12. Light

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