College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Chapter 25, Problem 17CQ
Conceptual Questions
What determines the nearest and farthest distances of objects that can be distinguished by pulsed radar?
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Electrodynamics
Let’s consider a small satellite (~1 kg) being pushed to the moon by nothing but radiation pressure on a 30 m2 reflective sail(although not entirely accurate, we’ll forget about gravity and orbital dynamics just to get a feel forthings). Estimate the time it would take for this satellite to travel to the moon. Note that on earth, thetime-averaged flux of electromagnetic energy from the sun is about 0.14 watts/cm2.
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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…
An EM wave in free space has a wavelength of 650 nm.
What is its frequency?
Express your answer to two significant figures and include the appropriate units.
f=
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Chapter 25 Solutions
College Physics
Ch. 25 - Review Question 25.1 What is the difference...Ch. 25 - Review Question 25.2 What needs to happen to...Ch. 25 - Review Question 25.3 How are GPS and radar...Ch. 25 - Review Question 25.4 If the frequency of one...Ch. 25 - Review Question 25.5 Electromagnetic waves are...Ch. 25 - Review Question 25.6 Explain why polarizing...Ch. 25 - Multiple Choice Questions The fact that light can...Ch. 25 - Multiple Choice Questions What does a beam of...Ch. 25 - Multiple Choice Questions What does Faraday's law...Ch. 25 - Multiple Choice Questions
4. Maxwell's hypothesis...
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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- Lunar astronauts placed a reflector on the Moon’s surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. (a) To what accuracy in meters can the distance to the Moon be determined, If this time can be measured to 0.100 ns? (b) What percent accuracy is this, given the average distance to the Moon is 384,480 kin?arrow_forwardA circular radar antenna on a Coast Guard ship has a diameter of 2.10 m and radiates at a frequency of 15.0 GHz. Two small boats are located 9.00 km away from the ship. How close together could the boats he and still he detected as two objects?arrow_forwardIllustrate that the size of details of an object that can be detected with electromagnetic waves is related to their wavelength, by comparing details observable with two different types (for example, radar and visible light).arrow_forward
- Laser vision correction often uses an excimer laser that produces 193-nm electromagnetic radiation. This wavelength is extremer strongly absorbed by the cornea and athletes it in a manner that reshapes the cornea to correct vision detects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also explain how this strong absorption limits damage to the lens and retina of the eye.arrow_forwardWhat is the wavelength of radio waves transmitted by a radio station with a frequency of 100 million cycles per second?arrow_forwardThe filament in a clear incandescent light bulb radiates visible light at a power of 5.00 W. Model the glass part of the bulb as a sphere of radius r0=3.00cm and calculate the amount of electromagnetic energy from visible light inside the bulb.arrow_forward
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- Do Maxwells equations allow for the existence of magnetic monopoles? Explain.arrow_forwardElectromagnetic radiation having a 15.0m wavelength is classified as infrared radiation. What is its frequency?arrow_forwardSome radar systems detect the size and shape of objects such as aircraft and geological terrain. Approximately what is the smallest observable detail utilizing 500-MHz radar?arrow_forward
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