Sunscreen An article in a medical journal says that a
Chapter , Problem 110A(choose chapter or problem)
Sunscreen An article in a medical journal says that a sunscreen with a sun protection factor (SPF) of 2 provides 50% protection against ultraviolet B (UVB) radiation, an SPF of 4 provides 75% protection, and an SPF of 8 provides 87.5% protection (which the article rounds to 87%). Source: Family Practice.a. 87.5% protection means that 87.5% of the UVB radiation is screened out. Write as a fraction the amount of radiation that is let in, and then describe how this fraction, in general, relates to the SPF rating.________________b. Plot UVB percent protection (y) against x, where x = 1/SPF.________________c. Based on your graph from part b, give an equation relating UVB protection to SPF rating.________________d. An SPF of 8 has double the chemical concentration of an SPF 4. Find the increase in the percent protection.________________e. An SPF of 30 has double the chemical concentration of an SPF 15. Find the increase in the percent protection.________________f. Based on your answers from parts d and e, what happens to the increase in the percent protection as the SPF continues to double?
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