Distance From the Sun
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1 Distance From the Sun Computer 32 Have you ever thought about what it would be like if you were on another planet looking back at the sun? In this activity, you will use the Light Probe to get an idea of how much light the planets would receive. OBJECTIVES In this activity, you will Make a simulation of the planets of our solar system to scale. Measure the amount of light from a light source at different distances. Draw conclusions about conditions on other planets. MATERIALS computer with Logger Lite software installed Go! Link interface TI Light Probe meter stick table or floor lamp with 60 watt bulb tape and marking pen PROCEDURE Part I Marking the Distances of the Planets 1. Make sure the Light Probe is connected to the Go! Link and that the Go! Link is connected to the computer. 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 32 Distance from Sun. Evaluation copy Elementary Science with Vernier 32-1
2 Computer Now you will use the meter stick and tape to make a scale model that shows the relative distances of the planets from the sun by following the steps below: a. Put 0 cm end of the meter stick at the light. b. Measure 10 cm from the light and mark the place with a piece of tape labeled Mercury. In this model, 25 cm is one Astronomical Unit, or AU. One AU is the distance from the Sun to the Earth. All of the other planet distances are compared to this distance between Earth and the Sun. c. Measure 20 cm from the light. Mark this place with a piece of tape labeled Venus. d. Continue marking the distances from the sun to the planets, using the Table of Distances, below. Table of Distances Planet Distance in meters Distance in AU Mercury 10 cm 0.4 AU Venus 18 cm 0.7 AU Earth 25 cm 1 AU Mars 38 cm 1.5 AU Jupiter 125 cm 5 AU Part II How Much Light Would Each Planet Get From the Sun? Key Question How does the light level change when you get farther away from the sun? Prediction Click on the Prediction button,, and draw how you think the light level will change as you increase the distance between the Light Probe and the light bulb. 5. Turn the lamp on, and then darken the room as much as possible. 6. Collect data by following the steps below: a. Decide who will hold the Light Probe and who will enter the data into the computer. b. Click to begin data collection. c. Put the probe at the position where Mercury is located in the model so the probe is pointing towards the lamp Elementary Science with Vernier
3 Distance From the Sun d. Look at the live meter on the computer screen, showing what light level is reaching the probe. Move the tip around a bit to get the highest reading you can. Careful: Make sure you are still pointing towards the lamp! e. Click to save this data point. f. In the box that appears on the screen, enter in the value for the planet location in AU based on the table above (for Mercury this value is 0.4) and then click. 7. Repeat Step 6 for each of the planets in the model. 8. When you have collected all your data, click to end data collection. 9. Write your observations on the Observations Sheet below. Observations Sheet Write observations about how the light level changes as you move away from the sun. Elementary Science with Vernier 32-3
4 Computer 32 ANALYZE YOUR DATA 1. Use the data from your graph to describe the light levels of the first five planets. 2. Write about two ways that we on Earth depend on the sun. 3. Imagine you have traveled to one of the outermost planets. Write a sentence that describes what the sunlight on the planet might be like and how the sun would look from that planet. 4. Imagine that we are going to try to begin a colony on another planet. Using what you know about how we on Earth depend on the Sun, and your data from this activity, describe what you would need to make the colony a place where humans could survive. Good job!! 32-4 Elementary Science with Vernier
5 Vernier Lab Safety Instructions Disclaimer THIS IS AN EVALUATION COPY OF THE VERNIER STUDENT LAB. This copy does not include: Safety information Essential instructor background information Directions for preparing solutions 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: Vernier Software & Technology S.W. Millikan Way Beaverton, OR Toll Free (888) (503) FAX (503)
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