Sunshine on My Shoulders

Sunshine on My Shoulders
Computer
34
Sunshine on My Shoulders
py
You have been asked by the ACME shirt company to design a shirt that will block the most
light for the company's new "Sunblocker" line of shirts. They have given you several
fabrics to test. Use a Light Probe to measure how much light is blocked by layers of the
different materials.
OBJECTIVES
In this activity, you will
•
•
Measure the light intensity as it passes through layers of different kinds of fabrics.
Predict which fabric will block the most light.
Draw conclusions about which fabric would be best for a shirt.
co
•
n
MATERIALS
ua
tio
computer with Logger Lite software installed
Go! Link interface
TI Light Probe
3 strips of different kinds of fabric
several books to hold the Light Probe
meter stick
KEY QUESTION
al
What makes a material good at keeping light from reaching your skin?
Ev
HYPOTHESIS
The
fabric will block the most amount of light and the
fabric will block the least amount of light because
Elementary Science with Vernier
34 - 1
Computer 34
PROCEDURE
1.
Do the following to get the Light Probe ready to collect data:
a. Make sure the Light Probe is connected to the Go! Link and that the Go! Link is
connected to the computer.
b. Get a stack of books that will raise the Light Probe to the level of the light source.
c. Place the probe so the tip is
sticking out about 3 cm in front of
the book.
d. Tape down the probe so it doesn’t
move during data collection.
e. Position the tip of the Light Probe
20 cm from the light source, with
the probe pointing directly at the
bulb.
2. Start Logger Lite on your computer.
3. Open the file for this activity by doing the following:
a. Click the Open button,
.
b. Open the file called “Elementary Science.”
c. Open the file called “34 Sunshine.”
4. Adjust the position of the Light Probe by doing the following:
a. Turn on the lamp.
b. Look at the light level reading in the digital meter on the screen. If the reading is
higher than 0.95, slide the books away from the lamp until it is below 0.95.
Important: Be sure to keep the probe pointing directly at the light bulb.
5. Now, by doing the following, you will collect data for 3 layers of the same fabric.
Careful: Make sure that the book and the Light Probe stay in the same place while you
are collecting data!
a. Click
to start data collection.
b. Click
and enter 0 for the number of layers.
c. Place one layer of fabric “A” over the tip of the Light Probe. Be careful not to put
your fingers between the probe and the light.
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Elementary Science with Vernier
Sunshine on My Shoulders
d. Click
.
, then enter 1 for the number of layers of fabric, and then click
e. Fold the fabric so that two layers cover the tip of the Light Probe. Click
and enter 2 for the layers of fabric. Click
.
f. Fold the fabric so that three layers cover the tip of the Light Probe. Click
enter 3 for the layers of fabric, and click
.
to end data collection and then click the Store button,
g. Click
data from the first fabric
,
, to save the
6. Repeat Step 5 for the other two fabrics.
ANALYZE YOUR DATA
1. Look at the three runs on the computer screen. Which fabric did the best job of
blocking out light?
2. Did your hypothesis match your results? Use your data to explain your answer.
3. If you were given three other fabrics, describe the characteristics you might look for
to help determine which one would be the best at blocking the light.
4. Write a formal letter to the ACME shirt company reporting your research and advising
them on which material will make a shirt that will block the most light.
Good job!!
Elementary Science with Vernier
34 - 3
Vernier Lab Safety Instructions Disclaimer
THIS IS AN EVALUATION COPY OF THE VERNIER STUDENT LAB.
This copy does not include:
z
Safety information
z
Essential instructor background information
z
Directions for preparing solutions
z
Important tips for successfully doing these labs
The complete Elementary Science with Vernier lab manual includes 43 labs and essential
teacher information. The full lab book is available for purchase at:
http://www.vernier.com/cmat/ewv.html
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