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9/29 - 7 th Grade Agenda

Dive into the world of electromagnetic waves and discover the properties of transparent, translucent, and opaque materials. Learn about radio waves, microwaves, and how we utilize them in everyday devices. Understand the differences between these materials and their interactions with light.

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9/29 - 7 th Grade Agenda

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  1. 9/29 - 7th Grade Agenda Learning Objective: Learn the difference between transparent, translucent and opaque materials. Collect: Reading & Notetaking: p. 36- 37 Passback Graded HW, Test & Grade Printout Class Reading: p. 46-50 HW: Reading & Notetaking : p.39 – 40 HW: Signed Grade Printout

  2. Daily Reflection • Prompt: Give 5 examples of electromagnetic waves. What is the one difference between all the electromagnetic waves? .

  3. Electromagnetic Wave • An electromagnetic wave consists of vibrating electric and magnetic field that move through space at the speed of lig____ ht

  4. What are some examples of electromagnetic waves? • Radio Waves • TV Signals • Microwaves • Infrared rays • Light • Ultraviolet rays • X-Ray

  5. How fast do electromagnetic waves travel? • It is the fastest thing in the universe • 300,000 km per second • 186,000 miles per second • It takes 8 minutes for light to travel from the sun to the earth • It takes 3 million years for light to travel from the nearest galaxy (andromeda) to the earth

  6. Electromagnetic Wavelength

  7. How do we use Radio Waves & Microwaves? • Radio & TV signals • Microwave Oven • Radar • MRI • Cell phone

  8. Using Microwaves • Why do you see sparks you put metal objects in a microwave? • Because of the build up of electrical energy in the metal • The long wave length of Microwaves can pass right through glass and plastic. That is why microwaves do not heat glass and plastic containers.

  9. Cell phone towers • These towers are placed 1 -2 miles apart in a city • They use M______wave to communicate with cell phones • They can be used to locate the loc_______ of the caller. icro ation

  10. How do we use Infrared Rays? • Conventional Oven • Heat Lamps • Thermograms

  11. Transparent Materials • Transparent material trans_____ most of the light that strike it. mit

  12. Translucent Materials • A translucent material sca____ light as it passes through, just as smoke, fog, and clouds scatter light as it passes through the air. tters

  13. Opaque Materials • An opaque material refl_____ or absorbs all of the light that strikes it. ects

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