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Light And Reflection

Light And Reflection. Overview. Light as a wave and a particle The Electromagnetic Spectrum Reflection Mirrors Polarization. The Origin of Light. How is light created? Created when an electron drops from a higher energy state to a lower one. Gives off light radiation.

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Light And Reflection

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  1. Light And Reflection

  2. Overview • Light as a wave and a particle • The Electromagnetic Spectrum • Reflection • Mirrors • Polarization

  3. The Origin of Light • How is light created? • Created when an electron drops from a higher energy state to a lower one. Gives off light radiation. • When light is absorbed the electron is moved from a lower energy level to a higher one.

  4. How does it create light? • The Sun • A light bulb • A candle

  5. Wave vs. Particle • What are the wave properties of light? • Reflection properties. • Transfer of energy to particles. • Refraction of light. • What are the particle properties of light? • Doesn’t need a medium. • Photoelectric effect.

  6. Photoelectric Effect • Previous theory. • Experiment-Shined light on a piece of sodium metal in a vacuum. • Caused electrons to be shot off the surface. • Amount of electrons increases with intensity of light.

  7. Review Questions • What is the photoelectric effect? • What are some wave properties of light and what are some particle properties of light? • Pick a source of light besides the ones previously mentioned and explain how it provides light.

  8. Electromagnetic Spectrum • What is the electromagnetic spectrum? • What are the different types of electromagnetic waves? • What is ROYGBIV?

  9. Electromagnetic Spectrum • All light travels at the same speed. What speed- 3 x 10^8 m/s. • Differences in frequency account for differences in electromagnetic waves. • Different types of waves • Radio waves, microwaves, infrared waves, visible light, ultraviolet light, X rays and gamma rays.

  10. Radio Waves • Lowest Frequency Waves. • Way to transmit radio stations and formerly wave to transmit television signals. • Wavelengths greater than 30 cm and frequency greater than 1.0 x10^9 Hertz. • AM and FM Radio

  11. Microwaves • Wavelengths between 30 cm and 1 mm. • Frequency between 1.0 x 10^9 Hertz and 3.0 x 10^11 Hertz. • Used in microwave ovens, anywhere else you can think off.

  12. Infrared (IR) Waves • Wavelengths between 1 mm and 700 nm. • Frequency between 3.0 x 10^ 11 Hertz and 4.3 x 10^14 Hertz. • What does infra mean? Explain infrared name. • Thermal imaging, night vision, weather forecasting.

  13. Review • What three types of electromagnetic waves did we learn about today and what are the every day uses of them? • What is ROYGBIV? • Which of the waves today has the most energy? The least? • Why is it called AM • Why is it called FM?

  14. Visible Light • Frequency from 4.3 x 10^14 Hz to 7.5 x 10^14 Hz. • Wavelengths range from 400 nm to 700 nm. • Referring to what we can see.

  15. Ultraviolet Light • Wavelengths range from 400 nm to 60 nm. • Frequencies range from 7.5 x 10^14 Hz to 5.0 x 10^15 Hz • Can be used to sterilize medical instruments.

  16. X-rays • Wavelengths between 60 nm and 1.0 x 10^-4 nm. • Frequencies between 5.0 x 10^15 Hz and 3.0 x 10^21 Hz. • What uses does it have?

  17. Gamma Rays • Frequencies between 3.0 x 10^18 Hz and 3.0 x 10 ^22 Hz. • Wavelengths between 1.0 x 10^-4 nm and 1.0 x 10 ^-5 nm. • Used to kill cancer cells.

  18. Review • What are the relative energy levels of the parts of the spectrum we went over today? • What are some uses of each?

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