Sunscreen contains compounds that absorb ultraviolet light. Whensunscreen is applied to skin, it prevents ultraviolet light from reach-ing the skin. The graph that follows shows the absorbance of lightas a function of wavelength for two different compounds (2-EHMCand TDSA) common in sunscreen. Absorbance is a measure of theamount of light absorbed by the compound-the higher the absor-bance, the more light is absorbed. Study the graph and answer thequestions.0.6UV-EUV-A0.50.42-EHMC0.3TDSA0.20.1290 300 310 320 330 340 350 360 370 380 390 400Wavelength (nm)Calculate the energy of a photon at the maximum absorptionof 2-EHMC.Absorba nce

The maximum absorbance value of 2-EHMC is 0.45. The wavelength corresponding to the maximum…

Answered: Sunscreen contains compounds that…

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter12: Chemical Bonding

Section: Chapter Questions

Problem 14CR

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Photoelectron spectroscopy applies the principle of the photoelectric effect to study orbital energies of atoms and mol ecules. High-energy radiation (usually UV or x-ray) is absorbed by a sample and an electron is ejected. The orbital energy can be calculated from the known energy of the radiation and the mea sured energy of the electron lost. The following energy differences were determined for several electron transitions: ∆E2→1 = 4.098x10-17 J ∆E3→£1 = 4.854x10-17 J ∆E5→1 = 5.242x10-17 J ∆E4→2 = 1.024x10-17 J Calculate ∆E and l of a photon emitted in the following transitions: (a) level 3 → 2; (b) level 4 → 1; (c) level 5→4.
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Percent absorbance of a particular wavelength of light in the soultion is 40%. Pb2+ ions is at the concentration is 4ppm, calculate the molarity. assume all the absorbance is due to Pb2+ ions. Density of water is 997kg/m^3 note a second point on the graph is (2,20) or (3,30)
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