College Physics
College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 25, Problem 26P

25.4 and 25.5 Frequency, wavelength, and the electromagnetic spectrum and Mathematical description of EM waves and EM wave energy.

& Light from an incandescent bulb Only about 10 **#x0025; of the electromagnetic energy from an incandescent lightbulb is visible light. The bulb radiates most of its energy in the infrared part of the electromagnetic spectrum If you place a 100-W lightbulb 2.0 m away from you, (a) what is the intensity of the infrared radiation at your location? (b) What is the infrared energy density? (c) What are the approximate magnitudes of the infrared electric and magnetic fields?

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CHECK YOUR UNDERSTANDING 1. Based on the electromagnetic spectrum, which EM wave has the shortest wavelength? the largest frequency? 2. Compare the energies emitted by long-frequency EM. waves with those carried by short- frequency EM waves. 3. How does the energy of the EM waves relate to their wavelength? 4. Prolonged exposure to sunlight can cause sunburn. Which EM waves emitted by the sun can easily cause sunburn: infrared waves or ultraviolet waves? Explain your answer. 5. The energy emitted by visible light is considered as bundles of electromagnetic energy called photons. If a 100 W light bulb has an average wavelength of 5.3x107 m, how many photons per second does it emit? 6. Microwaves are also used to cook food. If a microwave oven radiates microwaves with a wavelength of 2.2 cm, how much energy does it emit? 5.2 Low-Frequency EM Waves Low-frequency EM waves include radio waves, microwaves, infrared rays, and visible light Table 5-1 lists some of the properties of…
QUESTION 1 As the peak wavelength of light emitted by an object changes from radio waves to the infrared, how does the intensity of light change? O a. It increases linearly as wavelength increases O b. It decreases linearly as wavelength decreases O c. It increases inversely as wavelength decreases Od. It decreases inversely as wavelength increases Oe. Intensity does not depend on wavelength.
1. Which of the following physicist did not theorized the electromagnetic nature oflight? (answer only)a. Heinrich Hertzb. Michael Faradayc. Christiaan Huygensd. James Clerk Maxwell 2.15. What is the frequency of a yellow light if the energy that it can emit is equal to (answer only)3.4 x 10-19 J?a. 2.2 x 10-19 Jb. 3.6 x 10-19 Jc. 4.5 x 10-19 Jd. 5.1 x 10-19 J 3.What happens to the speed of light when it travels from air to glass? (answer only)a. Its speed increasesb. Its speed decreasesc. Its speed remains the samed. Its speed decreases then increases 4. What happens to the speed of light when it travels from air to glass? (answer only)a. Its speed increasesb. Its speed decreasesc. Its speed remains the samed. Its speed decreases then increases

Chapter 25 Solutions

College Physics

Ch. 25 - Multiple Choice Questions What does a simple...Ch. 25 - Multiple Choice Questions An electrically charged...Ch. 25 - Prob. 7MCQCh. 25 - Multiple Choice Questions If the amplitude of an E...Ch. 25 - Multiple Choice Questions 9. You notice that...Ch. 25 - Multiple Choice Questions You have two green...Ch. 25 - Prob. 11CQCh. 25 - Conceptual Questions What are two models that...Ch. 25 - Conceptual Questions 13. Summarize Maxwell's...Ch. 25 - Conceptual Questions What testable predictions...Ch. 25 - Conceptual Questions 15. Describe the conditions...Ch. 25 - Conceptual questions 16. Explain how radar works...Ch. 25 - Conceptual Questions 17. What determines the...Ch. 25 - Conceptual Questions How was the hypothesis that...Ch. 25 - Conceptual Questions 19. What is the difference...Ch. 25 - Conceptual Questions 20. How do polarized glasses...Ch. 25 - Conceptual Questions You bought a pair of glasses...Ch. 25 - Conceptual Questions Why. when we use polarized...Ch. 25 - Conceptual Questions 23 How does a polarizer for...Ch. 25 - Conceptual Questions 24. What is an LCD and how...Ch. 25 - Prob. 25CQCh. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - Prob. 8PCh. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.1 and 25.2 Polarization of waves and Discovery...Ch. 25 - 25.3 Applications of electromagnetic waves 11 EST...Ch. 25 - 25.3 Applications of electromagnetic waves 12.*...Ch. 25 - 25.3 Applications of electromagnetic waves 13. *...Ch. 25 - 25.3 Applications of electromagnetic waves *...Ch. 25 - 25.3 Applications of electromagnetic waves * TV...Ch. 25 - 25.3 Applications of electromagnetic waves **...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - Prob. 18PCh. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - Prob. 25PCh. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - 25.4 and 25.5 Frequency, wavelength, and the...Ch. 25 - Prob. 29PCh. 25 - 25.6 Polarization and light reflection 33. * An...Ch. 25 - 25.6 Polarization and light reflection * BIO...Ch. 25 - 25.6 Polarization and light reflection 35. * Two...Ch. 25 - 25.6 Polarization and light reflection * Light...Ch. 25 - Polarization and light reflection 37 * Light...Ch. 25 - 25.6 Polarization and light reflection 38.*...Ch. 25 - 25.6 Polarization and light reflection 40.* A beam...Ch. 25 - Prob. 41GPCh. 25 - * BIO EST Human vision power sensitivity A rod in...Ch. 25 - Prob. 44GPCh. 25 - Prob. 45GPCh. 25 - s experiment (described in Problem 25.45) the...Ch. 25 - * A sinusoidal electromagnetic wave in air has a...Ch. 25 - 48.* EST A microwave oven produces electromagnetic...Ch. 25 - with respect to the axis of the first polarizer....Ch. 25 - BIO Amazing honeybees The survival of a bee colony...Ch. 25 - BIO Amazing honeybees The survival of a bee...Ch. 25 - BIO Amazing honeybees The survival of a bee colony...Ch. 25 - BIO Amazing honeybees The survival of a bee colony...Ch. 25 - BIO Amazing honeybees The survival of a bee colony...Ch. 25 - Incandescent lightbulbs—soon to disappear ...Ch. 25 - BIO Amazing honeybees The survival of a bee colony...Ch. 25 - Incandescent lightbulbssoon to disappear Australia...Ch. 25 - Incandescent lightbulbs—soon to disappear ...Ch. 25 - Incandescent lightbulbs—soon to disappear...
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