Exposure to a sufficient quantity of ultraviolet will redden the skin, producing erythema −−a sunburn. The amount of exposure necessary to produce this reddening depends on the wavelength. For a 1.0 cm2cm2 patch of skin, 3.7 mJmJ of ultraviolet light at a wavelength of 254 nmnm will produce reddening; at 300 nmnm wavelength, 13 mJmJ are required. How many total photons with the wavelength of 254 nmnm produce this reddening of the 1.0 cm2cm2 of the skin? How many total photons with the wavelength of 300 nmnm produce this reddening of the 1.0 cm2cm2 of the skin?
Exposure to a sufficient quantity of ultraviolet will redden the skin, producing erythema −−a sunburn. The amount of exposure necessary to produce this reddening depends on the wavelength. For a 1.0 cm2cm2 patch of skin, 3.7 mJmJ of ultraviolet light at a wavelength of 254 nmnm will produce reddening; at 300 nmnm wavelength, 13 mJmJ are required. How many total photons with the wavelength of 254 nmnm produce this reddening of the 1.0 cm2cm2 of the skin? How many total photons with the wavelength of 300 nmnm produce this reddening of the 1.0 cm2cm2 of the skin?
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
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Exposure to a sufficient quantity of ultraviolet will redden the skin, producing erythema −−a sunburn. The amount of exposure necessary to produce this reddening depends on the wavelength. For a 1.0 cm2cm2 patch of skin, 3.7 mJmJ of ultraviolet light at a wavelength of 254 nmnm will produce reddening; at 300 nmnm wavelength, 13 mJmJ are required.
How many total photons with the wavelength of 254 nmnm produce this reddening of the 1.0 cm2cm2 of the skin?
How many total photons with the wavelength of 300 nmnm produce this reddening of the 1.0 cm2cm2 of the skin?
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