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Jumpstart & Outro

Objective 11/05/2012 Page 52. SWBAT compare light waves and properties to sound waves through notes and video clips. . Jumpstart & Outro. K-W-L Chart (What you KNOW, WANT to know and LEARNED about light…….. Go!. Introduction to Light PAGE 53.

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Jumpstart & Outro

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  1. Objective 11/05/2012 Page 52 SWBAT compare light waves and properties to sound waves through notes and video clips. Jumpstart & Outro K-W-L Chart (What you KNOW, WANT to know and LEARNED about light…….. Go!

  2. Introduction to Light PAGE 53

  3. Why is it that during a thunderstorm, you see the lightning, before you hear the thunder? Or during fireworks you see the colorful explosion, then hear the <<boom>>? • If you see lightning strike and you count “1, 2, 3…” seconds, how far away would the storm be? • Sound waves travel slower than light waves do! Sound waves travel 330 m/s through the air, while light waves travel 300 million m/s • The storm would be 3 miles away

  4. What is Light? • Light is an electromagnetic wave. It does not need a medium in order to travel. • Can travel in a vacuum (as well as air, water, glass) • Travels through space • Speed: 300 million m/s • Speed of light: written as c • E = mc2 • Light Ray: narrow beam of light that travels in a straight line • Is slowed down and even stopped by matter (opposite from sound!) • 3.5- THE STUDENT WILL RECOGNIZE THAT LIGHT IS A FORM OF ENERGY. [P8C1, P8C3] • Light- a special type of wave that carries energy

  5. Light vs. Sound • Longitudinal • Transverse • No, Mechanical wave • Yes, Electromagnetic wave • ~340 m/s (in air) • 300 million m/s (in vacuum) • 1,100 feet per second • 186,000 miles per second • More elastic/Denser medium = • Greater speed of sound • Sound travels through all substances • Light 1/3 slower in water than in air. • Light cannot pass through opaque materials • Seeing • Hearing • Low frequency = low pitch note • High frequency = high pitch note • Low frequency = red light • High frequency = violet light

  6. “The Magic of Sight—How Our Eyes Work” Video Guide- Page 1 Follow-Up Video Questions • What purpose do cones play in helping you to see? • What purpose do rods play? • Why does everything look black & white at night? • Why do you think cats might see better in the night? • The cat has an increased number of rods. In humans, 4 out of 5 light-sensitive cells in our retinas are rods, in cats, 25 out of 26 cells are rods. • Why might dogs see limited colors (just more than black and white)?

  7. It’s a Dog’s Life…

  8. July 11, 1910 - The New York Times • When light energy is absorbed, it is actually converted into heat energy!

  9. What happens to light rays when they hit an object?- Page 2 • 3.4- THE STUDENT WILL DIFFERENTIATE AMONG REFLECTION, REFRACTION, AND ABSORPTION OF WAVES. [P8C2] • When light rays hit an object, they are either: • Reflected • Absorbed • Transmitted(pass through the object) • What you see of an object depends on how the surface of it reflects light

  10. Types and Behavior of Light • Different objects allow different amounts of light to pass through them • The amount of light that passes through an object can be described as: • Transparent (def.)- • You can see objects reflectingon the other side of a transparent object; no blurriness or skewed look. • Ex. Windshield glass, air, saran wrap • Translucent (def.)- • Light is bent, so you may see the object through the material, but it would be blurry. • Ex. Frosted glass, wax paper • Opaque (def.)- • You cannotsee through them. • True / False. Most objects are opaque. Ex. Wood, metal, wool, cotton

  11. Video “Translucent, Transparent, Opaque”

  12. Types and Behavior of Light

  13. Objective 11/05/2012 Page 52 SWBAT compare light waves and properties to sound waves through notes and video clips. Jumpstart & Outro K-W-L Chart (What you KNOW, WANT to know and LEARNED about light…….. Go!

  14. Objective 11/08/2012 Page 54 SW relate and apply the properties of light to the EMS through notes. Jumpstart Answer the following questions about light using the words: “reflect”, “absorb” or “transmit (pass through)” in your answer. What do you notice when you wear dark colored clothes outside during the summer? Why do you think this is? What do you notice when you wear white, or light colored clothes in summer? Why do you think this is? Outro • Title of an article published July 11, 1910 in The New York Times: What is wrong with the thinking of the people who wrote this article? What do you think they may have meant by this statement? Do dark clothes really keep you cooler?

  15. Light & The EMS Notebook page 55 Packet Page 2

  16. EMS HEY!!! Set up your notebook… like this!

  17. Types and Behavior of Light • Different objects allow different amounts of light to pass through them • The amount of light that passes through an object can be described as: • Transparent (def.)- • You can see objects reflectingon the other side of a transparent object; no blurriness or skewed look. • Ex. Windshield glass, air, saran wrap • Translucent (def.)- • Light is bent, so you may see the object through the material, but it would be blurry. • Ex. Frosted glass, wax paper • Opaque (def.)- • You cannotsee through them. • True / False. Most objects are opaque. Ex. Wood, metal, wool, cotton

  18. Video “Translucent, Transparent, Opaque”

  19. Types and Behavior of Light

  20. EMS What is the EMS? • All of the frequencies of electromagnetic radiation • Visible light • X-Rays • Microwaves • Etc…

  21. EMS How do we use the EMS? Communications Diagnosing illness Cooking food Seeing invisible stuff Seeing, in general!

  22. What can we draw here to represent “Radio waves”?

  23. Objective 11/08/2012 Page 54 SW relate and apply the properties of light to the EMS through notes. Jumpstart Answer the following questions about light using the words: “reflect”, “absorb” or “transmit (pass through)” in your answer. What do you notice when you wear dark colored clothes outside during the summer? Why do you think this is? What do you notice when you wear white, or light colored clothes in summer? Why do you think this is? Outro • Title of an article published July 11, 1910 in The New York Times: What is wrong with the thinking of the people who wrote this article? What do you think they may have meant by this statement? Do dark clothes really keep you cooler?

  24. Bucket List - Page 3 • With your table partners, use your procedure to sort the items into groups based on properties having to do with reflection, absorption, or transmission of light. Then, discuss with your group why each item is sorted into the pile that it is. • In the data table, write the name of the material tested, and the observation of how light interacts with the object (i.e. reflects light, absorbs light, transmits light, does not transmit light, etc.) • Based on the diagrams on page 2, try to classify each material based on its properties, and record as your conclusion (transparent, translucent, opaque). • Draw conclusions based on your data. Classify based on the best transmitter of light, and the worst transmitter of light.

  25. Opaque, Transparent, Translucent Lab- Page 3 • Different objects allow different amounts of light to pass through them • The amount of light that passes through an object can be described as: • Transparent • Translucent • Opaque • Now, using the diagrams provided, write a hypothesis (IF, THEN, BECAUSE) for transparent, translucent, and opaque items.

  26. Opaque, Transparent, Translucent Lab- Designing the Experiment- Page 3 • Materials in your bucket: (you may need to add some lines to your materials section of the lab) • Balloon • Black paper • Cardboard • Plastic sandwich bag • Wax paper • Metal soup can • Graduated cylinder • Yellow plastic wrapping paper • White tissue paper • Blue felt fabric • Cling (Saran) wrap • Protractor • Plastic cup (2 kinds) • Plastic grocery bag • Plastic colored square w/ handle • Mirror • Straw • Lab apron • Optional: Choose two of your own objects to use!

  27. Procedure- Page 3 • Are there things you do every night before you go to bed? Are there things you do every morning when you wake up? • What is your “procedure” for what you do before you go to bed, and in the morning? • Brush teeth • Wash face • Make Lunch • Set alarm Clock… • Etc. • How do you dry off after a shower?! • You must write a procedure for how you are going to test and classify each item as either transparent, translucent or opaque.

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