Do Now:

In notebook:Fold down a page and start the next unit 2B.- Get colored pencils:

- Red- Orange- Yellow - Green- Blue- Violet

Try this:

Use the spectroscope to look at the lights in the room and then out the window.

Draw what you see under the AIM.Room’s light Sun’s light

Energy in the Atmosphere

Aim: What is electromagnetic energy?

Vocabulary for unit:

Electromagnetic energy or spectrum

Wavelength Reflected Absorbed Radiation

Visible light Ultraviolet light Infrared light Greenhouse Effect Global Warming

1. Electromagnetic Energy

All the types of energy from the sun.

The energy differs by its wavelength.

All of the different wavelengths of energy make up the electromagnetic spectrum.

Another word for energy from the sun is radiation.

Electromagnetic Spectrum

Electromagnetic Spectrum

2. Wavelength:

the distance from one crest to another

Short wavelengths have more energy

Long wavelengths have less energy

3. Visible Light…

a. Also called white light.

b. Made up of all colors…each color has its own wavelength.

c. Allows us to see – your eyes are sensitive to it.

d. It is 1 form of electromagnetic energy from the sun.

3. Visible Light continued …

e. When you see white, all of the wavelengths of color are being reflected (bounced back) off the material and into your eyes.

f. When you see black, all of the wavelengths of color are being absorbed (taken into) into the material…nothing is reflected into your eyes.

Colors we see….

Reflects green Absorbs every other color

Reflects nothing Absorbs every color

Reflects every color Absorbs nothing

What’s the difference between red and violet?

3. Visible Light continued…

g. Refracted light – passes through but is bent by the medium (the thing its passing through)

Example – water, glass

h. Scattered Light – light is reflected in many different directions as it bounces off the different gases in the atmosphere.

3. Visible Light continued…

4. Rainbows

Each color wavelength bends at different angles colors separate

Rainbows are made when water droplets in air act like tiny prisms

5. Three types of energy are important for the Earth.

Visible energy: light

Infrared (IR): heat

Ultra violet (UV) energy: damaging to cells

Summary:

Use your EM spectrum chart to answer the questions on handout .

Exit Ticket:

On the index card:NameExplain what is happening to visible light

energy when we look at a yellow shirt. Why do we see yellow?

Homework:

HW: Read textbook pages 42-45. Answer Qs #1-4 in notebook.

You must write out questions and answers.

Brain Pop: EM spectrum

http://www.brainpop.com/science/energy/electromagneticspectrum/

Energy in the atmosphere

AIM: How does the Earth get heated?

1. Two paths of energy from the Sun

a. Reflected: energy is bounced back into atmosphere by clouds and surfaces

b. Absorbed: energy is taken in by the surface or molecules of atmosphere

2. Earth’s surfaces absorb and reflect energy differently.

a. Clouds and ice reflect a lot of light energy.

b. Sand, soil and water absorb a lot of light energy.

3. Greenhouse Effect

a. Visible light energy is absorbed by the Earth’s surfaces and released as infrared energy…HEAT!

b. Carbon dioxide is the gas that traps the heat.

c. This is called the Greenhouse Effect.

Greenhouse Effect Diagram:

4. It’s a GOOD thing!

The Earth’s greenhouse traps just enough heat to keep our planet a good temperature for life.

What would the Earth be like without the greenhouse effect?

5. If we’re not careful…It’s a BAD thing!

Burning of fossil fuels adds carbon dioxide to the air.

The more greenhouse gases in the air, the more heat will be trapped and global warming will occur.

6. Brainstorm: What happens when global warming occurs?

7. Make a list of 10 things you can do to reduce global warming.