# Welcome!

YOUR NAME (OR NAMES IF GROUP PROJECT): _________________________________

As you go through the CEA Light Tour, you'll be using this question/answer form to answer the questions on your computer screen.

Good Luck!

WWW PAGE ONE: LIGHT TYPES

CIRCLE all of the light types you discovered in the LIGHT PUZZLE:

WWW PAGE TWO: THE SIZE OF AN ANGSTROM

1. What type of light has wavelengths the length of the following objects (fill in the blanks):

1. Molecule:_________________________

2. Blood Cell:_____________________

3. Fly:_____________________

4. Butterfly:_____________________

5. Earth:_____________________

2. What is true of a wavelength of visible light (place an "x" by the correct response):
• Smaller than a molecule
• Smaller than a blood cell but larger than a molecule
• Larger than a blood cell but smaller than a fly
• Larger than a fly but smaller than a butterfly
• Larger than a butterfly but smaller than the Earth
• Larger than the Earth

Can you briefly explain why the light we see (visible light) is the length that it is? (Hint: Think about the size of the human body):

```

```

3. Can You Recognize the Type of Light in Spectra?

The spectrum of white dwarf star Sirius_B is in:
_________________________________ (fill in light type)

The spectrum of Galactic Hydrogen Line is in:
_________________________________ (fill in light type)

```

```
WWW PAGE THREE: ELECTROMAGNETIC SPECTRUM

1. Look at the visible light spectrum on the page. At what wavelength does green merge into yellow? :_______________________

2. If a star is producing light that is 4,200 angstroms in wavelength, what type of light is coming from this star?:___________________

3. As you increase this star's output to wavelength's that measure 5,000 angstroms, then 6,000 angstroms, at what point(s) does the star's light change colors? :_________________________

4. Can you make a guess at the wavelength that visible light coming from a "Red Giant" star falls into?:_________________

Here's some even tricker questions!

5. What type of light besides blue blends into the violet part of visible light in the electromagnetic spectrum? :_____________________ Use the tool in the frame at the bottom of the page below to put in your angstrom entry and find out.

6. If a neutron star is producing light that is 200 angstroms in wavelength, what type of light is coming from this star? :_______________________

7. As you decrease this star's output to wavelength's that measure 80 angstroms, then 4 angstroms, at what point does the light begin to shift into another type?:______________________

8. What if a new star produces light that is 7,500 angstroms in length? What type of light would this star be producing?:_____________________

• And, the final challenge! Can you find the numerical boundaries scientists use to distinguish between ALL the light types of the ENTIRE electromagnetic spectrum (x-ray, gamma ray, infrared, ultraviolet, radio waves, extreme ultraviolet, microwave, and visible)? Fill out the Incredible Wavelength Form and the Electromagnetic Spectrum Page. They're attached to this answer form. (Teachers Print out Incredible Wavelength Form and Electromagnetic Spectrum Page which you will find on WWW Page Three: "Can You Re-Create The Electromagnetic Spectrum?" and attach)