Our Senses – Investigation 2 CAP
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Explain to students that photographers use light and darkness to add interest to their photos. Also, many animals hide in dark places so that they cannot be seen.
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In this short CAP, we simply want students to test for themselves that they need light (illumination) to see a object. There are only a few slides and one very quick experiment that can easily be done at a student’s desk.
We want to establish, by the end of this CAP, that vibrations make sound and sounds make vibrations.
This slide essentially asks students to remember, from his or her previous experience, if they can see things when there is no light. The teacher may wish to ask his or her students if they can recall an incident where they were unable to see or find something because there was not enough light.
This slide is inserted to prepare students for a simple experiment.
Have each student perform this experiment alone or with a partner. Help the students find a suitably small object that they can easily cup in their hands. Have them first observe the object open-handed. They will see the object under these conditions. Next, have them cup their hands to exclude external light and then peep through a crack in their grip and try to see the same object in the dark – in the absence of light.
The teacher may wish to turn out the lights in the room for the dark portion of this experiment to further prevent light from reaching the object. Better results may be obtained by placing the object on a desk and then cupping hands over the object and peeping in through a crack. Ask students, “Which sense did you use in this experiment?”. Student answers should focus on the sense of sight as the primary sense. However, students might also suggest hearing as it relates to the directions given, or touch since they held objects in their hands.
This final slide of a man in half shadow asks, “Why can’t we see one side of this man’s face?“. Students should respond by saying that they cannot see the right side of the man’s face because no light is shining on it. Thus, they can conclude that light is required for an object to be seen.