Please feel free to chat amongst yourselves until we begin at the top of the hour.

Seminar Agenda

IcebreakerUnit 4 DB PreviewWaves 101Grandma Pauline & her

microwaveQuestions & Answers

Any questions?Any questions?

Ice Breaker!

What are some of your favorite books?

 

Unit 4 Discussion Board PreviewFor the Unit 4 DB assignment, you will be assigned to a

team and must collaborate on the first part of the discussion.Teams will be formed and posted in an AnnouncementI will start a thread for each team within the Unit 4

Discussion Board. This is where you should post your information.

There are 3 components to this discussion, be sure to complete them all

Cite your resources!Be sure to collaborate with your team prior to the start

of Unit 4 by e-mail, AIM, or phone to divide up the work.

Any questions?Any questions?

Waves 101

Waves 101A wave is a disturbance that travels through

space and transports energy. Some waves, electromagnetic waves (light

for example), can travel through a vacuum. Other waves, known as mechanical waves,

can only travel through a medium such as a solid, liquid, or gas.

Although a wave may transport energy from one place to another, it does not transport mass.

Waves 101Visual representation

of waves: sinusoidal shape (S-shape) The points of

maximum displacement in the positive or negative direction are known as the "crests" and "troughs" of a wave.

Waves 101Three important characteristics that define waves

Amplitude: the measure of the maximum disturbanceRelated to the amount of energy carried by the

waveWavelength: the length of one complete wave cycle,

from crest to crestDifferent types of light have different wavelengths.

Frequency: a measure of the number of wave cycles that occur in a given amount of time

Frequency and Wavelength are closely related: the shorter the wavelength, the higher its frequency

Waves 101

Waves 101

Waves 101

Any questions?Any questions?

Grandma Pauline & her MicrowaveGrandma Pauline has just won a microwave oven in a radio contest. When it arrives at her house, it sits on her counter, unused, for a month.

One afternoon, when you visit her, she tells you that she is afraid to use it because:

"If I stand too close, I'll get radiated!”

Grandma Pauline & her Microwave

What can we tell Grandma Pauline to help her

understand this new technology?

Grandma Pauline & her Microwave

What’s the difference between the waves that are used in a

microwave oven and the dangerous nuclear radiation

she fears?

Grandma Pauline & her Microwave

How will this image help?

Grandma Pauline & her MicrowaveIf you took a similar infrared photo of

your body, what parts would you expect to show up as brightest orange?

What parts would be blue?

Why?

Grandma Pauline & her Microwave

If radio waves and microwaves are both electromagnetic waves, why can’t Grandma Pauline listen to

KBAQ-FM on her new oven?

Grandma Pauline & her Microwave

What might be some negative impacts of using Grandma Pauline’s new microwave

oven?

Any questions?Any questions?