As a demo to introduce this program, show the beads in the baggies. Demonstrate how beads change from white to coloured when exposed to UV light.
Distribute bracelet string to students. Have students tie a knot at one end.
Thread the beads on the string until desired length. Tie another knot to prevent the beads from falling off.
Explore UV light in our environment using the beads to indicate the presence of UV rays. Try activating the beads with a black light or sunlight and “blocking” UV rays with sunglasses or other materials.
Sunscreen is meant to protect your skin by blocking UV light. Put sunscreen on your beads and see whether they still turn colour. Do the beads turn colour on a cloudy day?
What makes the beads change colour?
What sources of light include UV wavelengths?
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