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Objective – Investigate the relationship between the amount of heat absorbed and the angle to the light source. Sun’s Height Above the Horizon (source: Universe at Your Fingertips) Materials Manila folder Angle Indicator Sheet Penlight Four sheets of graph paper Paper clip Procedure 1. Set out your materials. 2. Open the manila folder and paper clip the graph paper to the inside of the right half of the manila folder as shown in the diagram on the right. 3. Tape or glue the Angle Indicator Sheet to the inside of the left half of the folder as shown in the diagram. 4. Set up folder so the right half is flat on table and the left half is at 90o angle as shown in the diagram. Someone can hold the folder open so it forms a 90o angle, or a few stacked books can be used to hold the left side in place - a small piece of tape can help to keep the left side of folder next to the books. 5. The latitude of Brigham City is 41.5o North. Use the following data as you do this activity. Date Sun’s Angle Date Sun’s Angle Date Sun’s Angle 6/21 73o 9/21 50o 12/21 27o Objective – Investigate the relationship between the amount of heat absorbed and the angle to the light source. Date Sun’s Angle 3/21 50o 6. To simulate the Sun shining on the Earth, place the flashlight at the end of the angle line for the height of the Sun above the horizon at noon on the Summer Solstice (6/21), as shown in the diagram. You will need to develop a way to be sure the flashlight is always held… pointing straight along the angle line. the same distance out from the Angle indicator Sheet, so that the entire flashlight beam falls on the graph paper. Draw a circle around the flashlight beam on the graph paper. 7. Remove the graph paper, being sure to record what date the outline represents (e.g. Summer Solstice). 8. Have one team member count the number of squares covered by the flashlight beam. Be sure to develop a scheme to account for partially covered squares. Record the results on your group’s worksheet. 9. Repeat the process for other three seasons of the year. 10. Complete the worksheet. Objective – Investigate the relationship between the amount of heat absorbed and the angle to the light source. Group Members _______________________________________________________________ _____________________________________________________________________________ Absent _______________________________________________________________________ Sun’s Height Above the Horizon (source: Universe at Your Fingertips) 1. Complete the table. Number of Squares Circled Date Sun’s Angle 6/21 73o 9/21 50o 12/21 27o 3/21 50o Number of Squares Circled 2. Complete the table. Date with the most squares circled. Date with the fewest squares circled. Date(s) with the about the same number of squares circled. 3. Which season had direct sunlight (fewest number of squares circled)? Explain your answer. _____________________________________________________________________________ _____________________________________________________________________________ 4. Which season had indirect sunlight (most number of squares circled)? Explain your answer. _____________________________________________________________________________ _____________________________________________________________________________ Objective – Investigate the relationship between the amount of heat absorbed and the angle to the light source. 5. Explain how this activity demonstrates how the Sun’s angle in the sky affects the type of sunlight we receive. _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Objective – Investigate the relationship between the amount of heat absorbed and the angle to the light source.