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Item 7 The photoreceptors in the human eye, called rods and cones, have different sensitivities to different wavelengths of electromagnetic waves. (Figure 1) (Notice that the y axis in the figure is a logarithmic scale.) The rods, which number over 100 million, can only be activated by a certain range of wavelengths, but they do not pass any color information to the brain. In other words, they note differences in shades of grey (from black to white) and are responsible for a person's ability to see in dim light. Cones, which number around 6 million, give us color vision. Cones come in three different kinds: 64% of cones are sensitive to long wavelengths of visible light (toward the red end of the spectrum), 32% are sensitive to medium wavelengths, and the remaining 2% are sensitive to short wavelengths (toward the blue end of the spectrum). Colors are differentiated on the basis of the extent to which visible light stimulates each kind of cone. Figure Log relative sensitivity 0 350 400 Rods Cones 500 600 700 800 Wavelength (nm) 1 of 1 Part A Do rods have their peak sensitivity at a higher or lower frequency than cones? ▸ View Available Hint(s) O higher Olower Submit Part B Do rods and cones have similar sensitivities near the red or near the violet edge of the visible spectrum? ▸ View Available Hint(s) Ored O violet Submit Part C Is it easier to detect a dim red source or a dim violet source of light? ▸ View Available Hint(s) O red O violet Submit Part D 0 170 mm O

Item 7 The photoreceptors in the human eye, called rods and cones, have different sensitivities to different wavelengths of electromagnetic waves. (Figure 1) (Notice that the y axis in the figure is a logarithmic scale.) The rods, which number over 100 million, can only be activated by a certain range of wavelengths, but they do not pass any color information to the brain. In other words, they note differences in shades of grey (from black to white) and are responsible for a person's ability to see in dim light. Cones, which number around 6 million, give us color vision. Cones come in three different kinds: 64% of cones are sensitive to long wavelengths of visible light (toward the red end of the spectrum), 32% are sensitive to medium wavelengths, and the remaining 2% are sensitive to short wavelengths (toward the blue end of the spectrum). Colors are differentiated on the basis of the extent to which visible light stimulates each kind of cone. Figure Log relative sensitivity 0 350 400 Rods Cones 500 600 700 800 Wavelength (nm) 1 of 1 Part A Do rods have their peak sensitivity at a higher or lower frequency than cones? ▸ View Available Hint(s) O higher Olower Submit Part B Do rods and cones have similar sensitivities near the red or near the violet edge of the visible spectrum? ▸ View Available Hint(s) Ored O violet Submit Part C Is it easier to detect a dim red source or a dim violet source of light? ▸ View Available Hint(s) O red O violet Submit Part D 0 170 mm O

Physics for Scientists and Engineers: Foundations and Connections
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter34: Maxwell’s Equations And Electromagnetic Waves
Section: Chapter Questions
Problem 36PQ
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Item 7 The photoreceptors in the human eye, called rods and cones, have different sensitivities to different wavelengths of electromagnetic waves. (Figure 1) (Notice that the y axis in the figure is a logarithmic scale.) The rods, which number over 100 million, can only be activated by a certain range of wavelengths, but they do not pass any color information to the brain. In other words, they note differences in shades of grey (from black to white) and are responsible for a person's ability to see in dim light. Cones, which number around 6 million, give us color vision. Cones come in three different kinds: 64% of cones are sensitive to long wavelengths of visible light (toward the red end of the spectrum), 32% are sensitive to medium wavelengths, and the remaining 2% are sensitive to short wavelengths (toward the blue end of the spectrum). Colors are differentiated on the basis of the extent to which visible light stimulates each kind of cone. Figure Log relative sensitivity 0 350 400 Rods Cones 500 600 700 800 Wavelength (nm) 1 of 1 Part A Do rods have their peak sensitivity at a higher or lower frequency than cones? ► View Available Hint(s) higher lower Submit Part B Do rods and cones have similar sensitivities near the red or near the violet edge of the visible spectrum? ► View Available Hint(s) red violet Submit Part C Is it easier to detect a dim red source or a dim violet source of light? ► View Available Hint(s) red O violet Submit Part D
Transcribed Image Text:Item 7 The photoreceptors in the human eye, called rods and cones, have different sensitivities to different wavelengths of electromagnetic waves. (Figure 1) (Notice that the y axis in the figure is a logarithmic scale.) The rods, which number over 100 million, can only be activated by a certain range of wavelengths, but they do not pass any color information to the brain. In other words, they note differences in shades of grey (from black to white) and are responsible for a person's ability to see in dim light. Cones, which number around 6 million, give us color vision. Cones come in three different kinds: 64% of cones are sensitive to long wavelengths of visible light (toward the red end of the spectrum), 32% are sensitive to medium wavelengths, and the remaining 2% are sensitive to short wavelengths (toward the blue end of the spectrum). Colors are differentiated on the basis of the extent to which visible light stimulates each kind of cone. Figure Log relative sensitivity 0 350 400 Rods Cones 500 600 700 800 Wavelength (nm) 1 of 1 Part A Do rods have their peak sensitivity at a higher or lower frequency than cones? ► View Available Hint(s) higher lower Submit Part B Do rods and cones have similar sensitivities near the red or near the violet edge of the visible spectrum? ► View Available Hint(s) red violet Submit Part C Is it easier to detect a dim red source or a dim violet source of light? ► View Available Hint(s) red O violet Submit Part D
Figure Log relative sensitivity 0 350 Rods 400 Cones 500 600 700 800 Wavelength (nm) 1 of 1 ▼ Part D At 470 nm, which of the following statements is the most accurate? ► View Available Hint(s) O Rods are about 1000 times more sensitive than cones. O Rods are about 3 times more sensitive than cones. Rods and cones are about equally sensitive. O Cones are about 3 times more sensitive than rods. O Cones are about 1000 times more sensitive than rods. Submit Part E Complete previous part(s) Provide Feedback
Transcribed Image Text:Figure Log relative sensitivity 0 350 Rods 400 Cones 500 600 700 800 Wavelength (nm) 1 of 1 ▼ Part D At 470 nm, which of the following statements is the most accurate? ► View Available Hint(s) O Rods are about 1000 times more sensitive than cones. O Rods are about 3 times more sensitive than cones. Rods and cones are about equally sensitive. O Cones are about 3 times more sensitive than rods. O Cones are about 1000 times more sensitive than rods. Submit Part E Complete previous part(s) Provide Feedback
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