When the SPF of sunscreen is doubled,the percent of protection is doubled.

Name: When the SPF of sunscreen is doubled,the percent of protection is doubled.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

This statement is not entirely accurate. SPF measures the amount of UVB radiation blocked by sunscreen. Doubling the SPF does not necessarily mean the percent of protection is doubled. For example, an SPF 15 sunscreen blocks about 93% of UVB rays, while an SPF 30 blocks about 97%. So the increase in protection is not linear.

When the SPF of Sunscreen Is Doubled,the Percent of Protection