NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Study for the NAPLEX exam with a comprehensive quiz featuring multiple-choice questions and in-depth explanations. Build your pharmacological knowledge and increase your chances of passing the pharmacist licensure examination!

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How is Time to Burn (TTB) with sunscreen calculated?

SPF x TTB (without sunscreen)
TTB (without sunscreen) / SPF
SPF / TTB (without sunscreen)
TTB (with sunscreen) - SPF

The correct answer is: SPF x TTB (without sunscreen)

Time to Burn (TTB) is a measure of the amount of time a person can stay in the sun before getting a sunburn. It is calculated by multiplying the SPF (Sun Protection Factor) of a sunscreen by the TTB without sunscreen. Option B is the incorrect answer because it divides the TTB without sunscreen by the SPF, which would result in a larger TTB. Option C is also incorrect because it divides the SPF by the TTB without sunscreen, which would result in a larger SPF. Option D is also incorrect because it subtracts the SPF from the TTB with sunscreen, which would result in a smaller TTB. The correct formula for calculating TTB with sunscreen is to multiply the SPF by the TTB without sunscreen, as given in option A. This takes into account both the SPF and natural TTB of the skin to determine the overall TTB when using sunscreen.