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Item CL105002: Sunlight is most intense at a place on a day when the sunlight strikes that place at a 90° angle.

The two diagrams below show the earth on two different days of the year. The arrow indicates the place where a student lives.

Assuming that the sky above her is cloudless on both days shown above, on which day is sunlight more intense where she lives?

  1. Day 1 because the more the North Pole is angled toward the sun, the more intensely the sunlight strikes everywhere in the northern hemisphere.
  2. Day 2 because sunlight strikes where she lives at a 90° angle, and sunlight is most intense where it strikes the earth at a 90° angle.
  3. The intensity would be the same where she lives on both days shown in the diagrams because intensity of sunlight only depends on how far north or south a place is.
  4. How much the North Pole is angled toward the sun does not affect how intense the sunlight is where she lives. Sunlight has the same intensity where she lives on both days.
Distribution of Responses
Chart showing distrubtion of responses for Item CL105002
Students Responding Correctly
Group Correct Total Percent
Overall 1431 3314 43%
  6–8 707 1766 40%
  9–12 719 1536 47%
Primary Language

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