The Effect of SPF on the UV Rays Absorbed

The purpose of this project is to gather data on which type of SPF blocks UV rays the best. It was hypothesized that the higher the SPF of the sunscreen, the less the UV rays would be detected. Sunscreen was collected from the same brand and from the same website. The UV-lamp and the 4-cups were set up in the shape of a rectangle. A lid was laid flat on the ground, and the UV-lamp was placed on the lid. The sunscreen was used to cover the UV detecting card and allowed it to detect how much UV Radiation could get through. A hair dryer was used to dry the sunscreen. The card was then placed under the UV lamp, which was turned off. Once everything was set-up, the lamp and the stopwatch were turned on at the same time. At each previously chosen time interval, data was collected from the cards readings in order to tell the amount of UV rays detected