Ultraviolet solar radiation and photoprotection: a didactic sequence for a high school physics approach

Abstract

This work aims to address an educational product to be applied in 3rd year high school classes. The product is a Teaching Sequence (TS) focused on science-technology-society (STS), which aims to promote the learning of physical concepts related to electromagnetic waves, including the emission spectrum of electromagnetic radiation, with emphasis on ultraviolet radiation and the importance of photoprotection for human health. In the TS we tried to address issues related to ultraviolet radiation, its interference in people's health, including the risks, benefits, and care that should be taken to protect against this type of radiation. The TS activities include the construction of a spectrophotometer, from basic components and easily acquired materials. With this equipment it is possible to quantify percentage levels of absorption and transmittance in sunscreens as a function of the wavelength of the incident radiation, in this case UVA. This activity and the others in the Sequence can contribute to motivate and guide the learning of Physics concepts relevant to the topic and traditionally seen in the classroom, relating them to physical phenomena observed in everyday life. The triad that makes up the TS, formed by scientific conceptualization, use of technology and social implications, contemplates an STS approach.