Pearson eText for College Physics: Explore and Apply -- Instant Access (Pearson+)

2nd Edition

ISBN: 9780137443000

Author: Eugenia Etkina, Gorazd Planinsic

Publisher: PEARSON+

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Chapter 24, Problem 83RPP

Thin-film window coatings for energy conservation and comfort Thin-film coatings are applied to eyeglasses, computer screens, and automobile instrument panels to reduce glare and to binocular and camera lenses to increase the amount of light transmitted Thin-film coatings are also used to add color to architectural glass, to reduce surface friction, and to improve the energy efficiency of windows Consider this latter application.

Figure 24.30 shows that over 50 % of the radiation reaching Earth from the Sun is long-wavelength infrared radiation, which we perceive as warmth, not light Thin-film coatings on windows serve two purposes. (1) On warm days, the coatings reflect almost all of the infrared radiation from outside while allowing almost all of the visible light through the window (the glass absorbs most of the ultraviolet). The rooms inside stay cooler and require less air conditioning (2) On cold days, the same thin-film coating allows visible light to enter the room and reflects the thermal infrared radiation from the interior back into the room, keeping it warm. The reflectance of the thin-film window coating as a function of wavelength is shown in Figure 24.31.

Chapter 24, Problem 83RPP, Thin-film window coatings for energy conservation and comfort Thin-film coatings are applied to

A1.25 refractive index thin film on a 1.50 refractive index glass window is made to reflect infrared radiation of wavelength 1000 nm. What is the wavelength of the infrared radiation while in the thin film?

a. 670 nm

b. 800 nm

c. 1000 nm

d. 1250 nm

e. 1500 nm

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Chapter 24, Problem 82RPP

Chapter 24, Problem 84RPP

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Chapter 24 Solutions

Pearson eText for College Physics: Explore and Apply -- Instant Access (Pearson+)

Ch. 24 - Review Question 24.1 Explain why we observe...Ch. 24 - Prob. 2RQ Ch. 24 - Review Question 24.3 How do the locations of the...Ch. 24 - Review Question 24.4 If we look through a grating...Ch. 24 - Review Question 24.5 Equation (24.6),...Ch. 24 - Review Question 24.6 Stars are so far away that...Ch. 24 - Prob. 7RQ Ch. 24 - Multiple Choice Questions 1. You shine a...Ch. 24 - Multiple Choice Questions When you shine a very...Ch. 24 - Prob. 3MCQ

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