![]() ![]() Explain to students that ultraviolet light is dangerous to humans.Tell students that the blacklight emits UV light, not visible light, so it doesn’t look bright to us. Demonstrate how tonic water fluoresces when the black light is turned on. An ingredient in tonic water, called quinine, absorbs UV and releases it, causing it to glow blue (or fluoresce). Unlike visible light, we can’t see UV, but some materials react in its presence. UV light has a wavelength slightly shorter than visible light. Explain that different types of light are part of the electromagnetic spectrum.Survey student knowledge of ultraviolet (or UV) light and student experience with Sun damage such as sunburns and skin cancer.Introduce the activity, telling students that they will explore ultraviolet wavelengths of sunlight, which are dangerous and cause skin damage.(You do not need to turn on the blacklight until it is time to demonstrate.) Fill two cups with tonic water and place them in front of the black light. Set up the blacklight in the classroom where all students can see it.Provide the EPA Sun Safety Action Steps reading for students, either as a handout or on computers/tablets.*Note: Frisbees that change color in UV light can be used instead of cups of tonic water in this activity. Other items that are used for shade such as umbrellas.Types of fabric/clothing typically worn to cover up from the Sun.Clear plastic bags or overhead transparency sheets.Sunscreen (the spray variety is recommended.A piece of dark cloth to darken the lamp and cups. ![]()
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