Concept explainers
Assessment
Sunscreens block ultraviolet (UV) rays produced by the sun. These rays are harmful and each sunscreen has a Sun Protection Factor (SPF) that tells you how long you can be exposed before you receive 1minute of UV rays. For example, if you use sunscreen with SPF
a. A sunscreen with SPF
b. Suppose a sunscreen blocks
c. What is the SPF for the sunscreen in Part (b)?
d. Carol bought sunscreen with a SPF
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