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Light And Reflection. Overview. Light as a wave and a particle The Electromagnetic Spectrum Reflection Mirrors Polarization. But First…. A test the first day back…..oh no he didn’t! Pre-assessment of what you already know of light. Do your best, we will go over. The Origin of Light.

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Presentation Transcript
overview
Overview
  • Light as a wave and a particle
  • The Electromagnetic Spectrum
  • Reflection
  • Mirrors
  • Polarization
but first
But First….
  • A test the first day back…..oh no he didn’t!
  • Pre-assessment of what you already know of light.
  • Do your best, we will go over.
the origin of light
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.
how does it create light
How does it create light?
  • The Sun
  • A light bulb
  • A candle
wave vs particle
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.
photoelectric effect
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.
review questions
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.
electromagnetic spectrum
Electromagnetic Spectrum
  • What is the electromagnetic spectrum?
  • What are the different types of electromagnetic waves?
  • What is ROYGBIV?
electromagnetic spectrum1
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.
radio waves
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
microwaves
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.
infrared ir waves
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.
review
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?
visible light
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.
ultraviolet light
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.
x rays
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?
gamma rays
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.
review1
Review
  • What are the relative energy levels of the parts of the spectrum we went over today?
  • What are some uses of each?