1. 9/ th Grade Agenda
Learning Objective: Learn the difference between transparent, translucent and opaque materials.
Collect: Reading & Notetaking: p
Passback Graded HW, Test & Grade Printout
Class Reading: p
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 icro ation
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