Sunscreens are designed to protect the skin from harmful rays from the sun in th

Question

Sunscreens are designed to protect the skin from harmful rays from the sun in the region of 280-400nm. A sunscreen product labeled SPF 15 transmits 7.0% of light at 280 nm. What is the absorbance of sunscreen at 312 nm.
A.) 2.00 B.) 1.15 C.) 0.185 D.) None Sunscreens are designed to protect the skin from harmful rays from the sun in the region of 280-400nm. A sunscreen product labeled SPF 15 transmits 7.0% of light at 280 nm. What is the absorbance of sunscreen at 312 nm.
A.) 2.00 B.) 1.15 C.) 0.185 D.) None
A.) 2.00 B.) 1.15 C.) 0.185 D.) None

Explanation / Answer

Assuming the transmittance is same at 280 nm and 312 nm

Absorbance = 2- log %T

Absorbance = 2 - log 7

Absorbance = 2 - 0.845

Absorbance = 1.15

SO the correct answer is option (B)

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