Objectives. Materials TI-73 CBL 2

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1 . Objectives Activity 19 To determine the relationship between temperature and light intensity To understand the effect of other atmospheric factors on weather Materials Sunrise, Sunset Weather Match TI-73 Unit-to-unit cable CBL 2 Temperature sensor Light sensor Data Collection and Analysis pages (p ) In this activity you will Use the CBL 2 with a temperature sensor and light sensor to collect temperature and light intensity data for a 24-hour period. Graph the data collected to find any patterns in temperature and light intensity that occur. Problem Does the highest temperature occur when the light intensity is the greatest, and does the lowest temperature occur when the light intensity is the least? Introduction Earth rotates one full turn on its axis every 24 hours. Day occurs on Earth when locations face toward the sun, and night occurs when those locations face away from the sun. By reviewing light intensity and temperature data for a 24-hour period, you can analyze various weather changes, such as when sunrise and sunset occur, when the temperature is the highest and lowest, and more. Hypothesis Before testing, complete the Hypothesis section on the Data Collection and Analysis page to predict temperature and light intensity data for a 24-hour period.

2 178 Activities for Middle Grades Science with the CBL 2 and the TI-73 Procedure: Collecting the Data 1. Put the CBL 2 in a place where you can leave it for 24 hours. The location can be outdoors, but the CBL 2 should be protected from rain or dew. Putting the CBL 2 on a covered patio or placing it in a plastic bag (leaving the sensors out) are two options. 2. Plug the temperature sensor into Channel 1 (CH 1) and the light sensor into Channel 2 (CH 2) on the CBL Start the DATAMATE program. 4. The Main Screen is displayed. CH 1:TEMP(C) and CH 2:LIGHT are displayed at the top of the screen 5. Select 1:SETUP. Select MODE, and then select 2:TIME GRAPH. 6. The TIME GRAPH SETTINGS are displayed. If the screen shows TIME INTERVAL: 1800, NUMBER OF SAMPLES: 48, and EXPERIMENT LENGTH: 86400, go to step 8. If the settings are not correct, go to step Select 2:CHANGE TIME SETTINGS. For ENTER TIME BETWEEN SAMPLES IN SECONDS:, enter For ENTER NUMBER OF SAMPLES:, enter 48. The TIME GRAPH SETTINGS screen reappears, showing the new settings. 8. Select 1:OK twice to return to the Main Screen. 9. When the CBL 2 is in the testing location, press 2:START. The CBL 2 beeps twice and displays a graph with the temperature in C and the light intensity reading in the upper right-hand corner. When the experiment starts, press b to quite DATAMATE but continue collecting data. 10. After 24 hours, the CBL 2 will be finished collecting data. The main graph screen is displayed. Select 3:RESCALE and 1:AUTOSCALE to display a graph showing the temperature data that was collected. Use " and! to move to each data point. On the Data Collection and Analysis page, record the temperature for each 30-minute interval in the table, and sketch the graph. 11. Press b 4:RETURN 4:MORE 1:L3 VS L1 to display a graph showing the light intensity data that was collected. Use " and! to move to each data point. On the Data Collection and Analysis page, record the light reading for each 30-minute interval in the table, and sketch the graph. 12. Press b 6:L2 AND L3 VS L1 to display the light and temperature graphs together. Sketch the graph on the Data Collection and Analysis page. 13. To exit from the DATAMATE program, press b 8:RETURN TO GRAPH SCREEN 1:MAIN SCREEN. Select 6:QUIT and press b. 14. To display the lists showing the results, press 3. The times are stored in L1, the temperatures are stored in L2, and the light readings are stored in L3.

4 Data Collection and Analysis Name Date Activity 19: Sunrise, Sunset Weather Match Problem Does the highest temperature occur when the light intensity is the greatest, and does the lowest temperature occur when the light intensity is the least? Hypothesis 1. Sketch predicted graphs of temperature and light intensity plotted over a 24-hour period. Mark starting times and reference time points on the x-axis. Plot temperature in degrees Celsius and light intensity on the y-axis. Share your prediction with the class. Temperature versus Time Light Intensity versus Time 2. The highest temperature occurs when the light intensity is the greatest, and the lowest temperature occurs when the light intensity is the least.

5 Activity 19: Sunrise, Sunset Weather Match 181 Data Collection 1. At the end of the 24-hour period, use the data stored in the lists on the TI-73 to complete the following table. (Make additional copies of the table if necessary.) Time (hours : minutes) Temperature ( C) Light Intensity (milliwatts/cm 2 )

6 182 Activities for Middle Grades Science with the CBL 2 and the TI Sketch and label the line graphs of the temperature and light intensity data over time, or print them on the computer and attach them to this page. Temperature Light Intensity 3. Sketch and label the double line graph showing the temperature and light intensity data over time together, or print it on the computer and attach it to this page. Temperature and Light Intensity Data Analysis 1. Refer to the table and graphs. How do day/night affect the temperature patterns and light intensity patterns? 2. Identify any weather situations causing the peaks and valleys on the graphs.

7 Activity 19: Sunrise, Sunset Weather Match Compare the actual graphs to your predicted graphs in your hypothesis. Were your predictions reasonable? What surprised you about the actual graphs? 4. From the home screen, use the - v MATH menu to calculate statistical analyses with the temperature (L2) and light intensity (L3) lists. Enter the values in the table below. Use ranges for periods of time that had the same temperature or light readings. Description Actual Readings Time of Reading Maximum temperature Minimum temperature Temperature range (put in Time column) Mean temperature over 24 hours Median temperature Maximum light intensity Minimum light intensity Light intensity range (put in Time column) Mean light intensity Median light intensity When was sunrise (based on the light intensity)? When was sunset (based on the light intensity)? 5. Compare the median temperature to the mean. Which one appears to be more stable? Which reflects the data best? 6. Write a weather report based on your data for the 24-hour period.

8 184 Activities for Middle Grades Science with the CBL 2 and the TI-73 Conclusion 1. Refer to the graph that shows the temperature and light intensity together. What patterns do you notice between the two graphs? 2. The highest temperature occurs when the light intensity is the Application greatest, and the lowest temperature occurs when the light intensity is the least. Sketch your temperature versus time graph here for the hypothetical series of events. Plot time on the x-axis and temperature in C on the y-axis. Temperature versus Time

9 Activity 19: Sunrise, Sunset Weather Match 185 Teacher Notes Objectives Activity 19 To determine the relationship between temperature and light intensity To understand the effect of other atmospheric factors on weather Sunrise, Sunset Weather Match NSES Standards Earth and Space Science: Structure of the earth system Earth and Space Science: Earth in the solar system Physical Science: Transfer of energy Preparation If you want to collect you data outside, plan to do this activity when it is unlikely to rain. However, you should still set up the CBL 2 and sensors where they will be protected from getting wet. To explore additional temperature and light intensity patterns, repeat this activity on several consecutive days. Also consider collecting the temperature and light intensity data on various days throughout the year. Management Assign these student jobs for this lab: Materials/setup person (sets up samples, sensor) Tech person (operates CBL 2 and TI-73) Data recorder (reads temperatures from the TI-73 at each collection interval) Runner (brings CBL 2 and TI-73 to the computer to print graphs with TI-GRAPH LINK or TI Connect and brings Data Collection and Analysis pages to the teacher) Clear covered plastic shoeboxes will hold the CBL 2, temperature sensors, and other equipment neatly at each station.

10 186 Activities for Middle Grades Science with the CBL 2 and the TI-73 Students can record data points in their lab journals as they are displayed on the TI-73. This keeps them engaged throughout the data collection period and if they lose the data/graph later, they can still write up their lab reports. Students can also access the data in the TI-73 lists after data collection. You can send lists to all students calculators using 9 1:Link. a. Press 9. b. Press b to select 1:Link. c. Select 4:List and press b. d. Press # to move the 4 beside the list you wish to send. Press b. e. Repeat step d for each list you wish to send. f. Set the receiving unit by pressing 9 b " to select RECEIVE. Press b. Waiting displays on the TI-73 screen. g. On the sending unit, press " to select TRANSMIT and press b. For more permanent storage of data, use TI-GRAPH LINK or TI Connect to save the lists in a computer folder. However, students may inadvertently lose their data or overwrite it in the next trial, so recording data in journals is a good option. Students can assess each other using a teamwork rubric after the lab. Provide a checklist of positive and negative behaviors. Copy these on quarter sheets of paper.

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