10/13 - 7th Grade Agenda Collect: HW: p

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Presentation transcript:

10/13 - 7th Grade Agenda Collect: HW: p.35- 36 Transparent, Translucent and Opaque Materials Video: Light & Color Class Reading: p. 46- 50 HW: Workbook: p. 39- 40

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

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

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

Electromagnetic Wavelength

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

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.

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

Visible Light makes up only a small part of the electromagnetic spectrum

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

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

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

Why does the apple appear red? Because the red light reflect it. All other light are absorbed.

What do you notice about the apple when it is shown in red light?

What do you notice about the apple when it is shown in green light?

What do you notice about the apple when it is shown in blue light?

What are the three primary colors of light? Red, Blue, Green

What are the three primary colors of pigment? Yellow, Magenta, Cyan What color do you get when you combine the three primary colors of pigment?

Why do three primary colors of pigments produce black instead of white? As pigments are added together, fewer colors of light are reflected and more are absorbed

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