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Light Week 2

Light Week 2. Day 1: EM Spectrum Day 2: Light and Color Day 3: Property of Light-Transmission. I Can…. I Can #3:identify and describe the 7 waves of the electromagnetic spectrum. Electromagnetic Waves. Unlike mechanical waves, EM Waves can travel through empty space.

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Light Week 2

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  1. Light Week 2 Day 1: EM Spectrum Day 2: Light and Color Day 3: Property of Light-Transmission

  2. I Can… • I Can #3:identify and describe the 7 waves of the electromagnetic spectrum.

  3. Electromagnetic Waves • Unlike mechanical waves, EM Waves can travel through empty space. • Light waves are an example of EM waves.

  4. The Electromagnetic Spectrum • From highest energy to lowest energy: • Gamma Ray • X-Ray • UV Light • Visible Light • Infrared • Microwave • Radio Great X-men Use Very Important Mutant Radios

  5. Radio Waves • Longest wavelength (average size=length of football field) • Lowest frequency and energy • Used in radios and can carry signals for cell phones and television. • What do you think the station numbers mean?

  6. Microwaves • Longer microwaves (about a foot) used in microwaves to heat our food. • They pass through glass, plastics, and ceramics, but are reflected by thick metal. They are absorbed by water, fats, and sugars--when absorbed they convert directly to heat.

  7. Infrared • Range in size--far infrared light (size of pinhead) to near infrared light (size of a cell). • Far infrared waves are the heat waves we feel from sunlight, a fire, a warm sidewalk, or a heat lamp. • Near infrared are not hot at all--used in remote controls.

  8. Visible Light • Only a small proportion of the EM spectrum • Only EM wave that humans can see. Humans can see visible light because the eye can only detect frequenciesin the middle of the EM spectrum. • Which color has the most energy? Least?

  9. Ultraviolet (UV) Light • More energy than visible light and shorter wavelength • Positive Effects: kill bacteria on food and during surgery. Stimulates production of Vitamin D in our skin cells. • Negative Effects: skin cancer, sunburn, and wrinkles, • Where may you have seen UV light before in your life?

  10. X-Rays • X-Rays can go through muscle and tissue but are blocked by bone. • Makes medical and dental X-Ray photographs possible. • Too much exposure to X-Rays can lead to cancer.

  11. Gamma Rays • Shortest wavelength-smaller than atoms! Can penetrate most materials. • The highest energy. • Used to kill cancerous cells and released by nuclear weapons.

  12. Gamma Rays • What are gamma ray bursts? • Do gamma rays have a high or low energy level?

  13. The Electromagnetic Spectrum • From highest energy to lowest energy: • Gamma Ray • X-Ray • UV Light • Visible Light • Infrared • Microwave • Radio Great X-men Use Very Important Mutant Radios

  14. Electromagnetic Foldable • Work on your EM foldable. • As you work enjoy this short Captain Planet on UV Radiation! Look/listen for the effects of too much UV Radiation!

  15. Exit Quiz • What are the seven waves of the EM spectrum? • Which type of EM wave would you definitely want to stay away from? Why?

  16. I Can… • I Can #4: describe how light interacts with our eyes to help us see color

  17. The Wonderful World of Color • What do we need to see color? • What colors combined made white?

  18. Light and Vision • For you to see an object, light from the object has to reach your eye.

  19. Sources of Light • An object can either be a primary source of light or a secondary source. • Secondary: reflects light from source • Primary: gives off its own light

  20. COLOR Because light is a WAVE, each color we see has a different frequency, energy, and wavelength. • VIOLET has the highest frequency, highest energy, and shortest wavelength. • RED has the lowest frequency, lowest energy, and longest wavelength.

  21. White Light • White light consists of all the colors of light.

  22. Primary Colors of Light • RED • GREEN • BLUE WHITE

  23. How do we see color? • When we see colors, it is because that light wave is reflected into our eyes. • All other colors are absorbed.

  24. Seeing White …. • When ALL colors are REFLECTED, we see white.

  25. Seeing Black… • When ALL colors are ABSORBED, we see black.

  26. Challenge…. • What color will a YELLOW ball be under BLUE light?

  27. Color Test

  28. Let's Review • Blue– All colors absorbed except blue, which is reflected to eye. • White – No colors absorbed. All colors reflected to eye. • Black– All colors absorbed. No colors reflected to eye.

  29. Activity Instructions For this activity, you will be given sticks with different colored squares. You will see objects of various colors on the screen. Hold up the colors that are absorbed by the object. Then, Hold up the color that is reflected by the object.

  30. Confused??? It’s okay…let’s give it a shot. What is absorbed? (Hold up colors) What is reflected? (Hold up color)

  31. I Can#5 I Can: define refraction and explain how refraction may be observed in the real world.

  32. Light Travels in Straight Lines • Light always travels in straight lines unless the medium it travels through changes.

  33. Property #1: Transmission • Transmission happens when light waves strike something and passes through it. • When you see through glass, it is because light is able to pass through the glass.

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