Chemistry: Structure and Properties (2nd Edition)
2nd Edition
ISBN: 9780134293936
Author: Nivaldo J. Tro
Publisher: PEARSON
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Chapter 2, Problem 112E
Sunscreen contains compounds that absorb ultraviolet light. When sunscreen is applied to skin, it prevents ultraviolet light from reaching the skin. The graph that follows shows the absorbance of light as a function of wavelength for two different compounds (2-EHMC and TDSA) common in sunscreen. Absorbance is a measure of the amount of light absorbed by the compound-the higher the absorbance, the more light is absorbed. Study the graph and answer the question
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- Calculate the energy of a photon at the maximum absorption of TDSA.
- Calculate the energy of a photon at the maximum absorption of 2-EHMC.
- Which compound absorbs more energy at its maximum absorption?
- Why do you think sunscreens commonly contain both of these compounds and not just one of them?
- Assuming that sunlight produces 3.066 x 1022^ V ph°tQ1is, ^atthe skin absorbs one-half of these photons (and m2 • s reflects the other half), calculate the total UV energy absorbed over 0.42 m2 of skin that is exposed to sunlight for one hour. Assume that the average wavelength of the UV photons is 330 nm.
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Chapter 2 Solutions
Chemistry: Structure and Properties (2nd Edition)
Ch. 2 - Why is the quantum-mechanical model of the atom...Ch. 2 - What is light? How fast does it travel in a...Ch. 2 - Define the wavelength and amplitude of a wave.Ch. 2 - Define the frequency of electromagnetic radiation....Ch. 2 - What determines the color of light? Describe the...Ch. 2 - What determines the color of a colored object?...Ch. 2 - Give an approximate range of wavelengths for each...Ch. 2 - Explain the wave behavior known as interference....Ch. 2 - Explain the wave behavior known as diffraction....Ch. 2 - Describe the photoelectric effect. How did...
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