College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Textbook Question
Chapter 25, Problem 21CQ
Conceptual Questions
You bought a pair of glasses that are marketed as having polarizing filters. How can you test this claim if (a) you have another pair of identical glasses, and (b) you have only one pair of glasses and no other polarizer (and you are not allowed to break the glasses)?
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Unpolarized light is sent through a polarizer with its polarization axis vertical. Then it
goes through a second polarizer with its polarization axis at an angle of 30° clockwise from the
11.
vertical. Finally, it goes through a third polarizer with its axis at an angle of 70° clockwise from
the vertical. The initial intensity of the light is I, = 1000",
a. What does it mean to say that light is polarized?
b. What is the intensity of the light after going through the first polarizer?
c. What is the intensity of the light after going through the third polarizer?
A powerful AM radio station that has a peak output
power of 115 kW emits energy upward and outward but
not downward so that it radiates uniformly across a
hemispherical region as shown in the figure.
Wave fronts
Antenna
What is the maximum electric field amplitude of a signal that is received 87 km from the station?
Emax = 3.17e-5
x N/C
Polarisation can be found in many sections of physics even in electrostatics. Examples of 'home-testable experiments' that shows charge polarisation include
A. Rubbing a balloon against your hair to get it 'charged' up!
B. Rubbing a plastic ruler with a woollen cloth.
C. none of the given options are correct.
D. Rubbing a glass rod with a silk cloth.
Chapter 25 Solutions
College Physics
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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
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38.*...Ch. 25 - 25.6 Polarization and light reflection
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- You use a sequence of ideal polarizing niters, each with its axis making the same angle with the axis of the previous filter, to rotate the plane of' polarization of a polarized light beam by a total of 45.0. You wish to have an intensity reduction no larger than 10.0%. (a) How many polarizers do you need to achieve your goal? (b) What is the angle between adjacent polarizers?arrow_forwardYou use a sequence of ideal polarizing filters, each with its axis making the same angle with the axis of the previous filter, to rotate the plane of polarization of a polarized light beam by a total of 45.0. You wish to have an intensity reduction no larger than 10.0%. (a) How many polarizers do you need to achieve your goal? (b) What is the angle between adjacent polarizers?arrow_forwardSuppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. (i) What is the direction of the magnetic field created by that current at the center of the mirror? (a) left (b) right (c) horizontally toward you (d) horizontally away from you (e) no direction because the field has zero magnitude (ii) What is the direction of the field the current creates at a point on the wall outside the frame to the right? Choose from the same possibilities as in part (i).arrow_forward
- Unpolarized light passes through three polarizing filters. The first filter has its transmission axis parallel to the z direction, the second has its transmission axis at an angle of 30.0 from the z direction, and the third has its transmission axis at an angle of 60.0 from the z direction. If the light that emerges from the third filter has an intensity of 250.0 W/m2, what is the original intensity of the light?arrow_forwardUnpolarized light passes through two Polaroid sheets. The transmission axis of the analyzer makes an angle of 53.0 with the axis of the polarizer. (a) What fraction of the original unpolarized light is transmitted through the analyzer? (b) What fraction of the original light is absorbed by the analyzer?arrow_forwardIf plane polarized light is sent through two polarizers, the first at 45 to the original plane of polarization and the second at 90 to the original plane of polarization, what fraction of the original polarized intensity passes through the last polarizer? (a) 0 (b) 14 (c) 12 (d) 18 (e) 110arrow_forward
- A spherical interplanetary grain of dust of radius 0.2 m is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun's light. (i) Assume the grain is moved to a distance 2r1 from the Sun and released. At this location, what is the net force exerted on the grain? (a) toward the Sun (b) away from the Sun (c) zero (d) impossible to determine without knowing the mass of the grain (ii) Now assume the grain is moved back to its original location at r1, compressed so that it crystallizes into a sphere with significantly higher density, and then released. In this situation, what is the net force exerted on the grain? Choose from the same possibilities as in part (i).arrow_forwardAn AM radio transmitter broadcasts 50.0 kW of power uniformly in all directions. (a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what is the intensity 30.0 km away? (Hint: Half the power will be spread over the area of a hemisphere.) (b) What is the maximum electric field strength at this distance?arrow_forward(a) On a day when the intensity of sunlight is 1.00kW/m2 , a circular lens 0.200 m in diameter focuses light onto water in a black beaker. Two polarizing sheets of plastic are placed in front of the lens with their axes at an angle of 20.0°. Assuming the sunlight is unpolarized and the polarizers are 100% efficient, what is the initial rate of heating of the water in °C/s, assuming it is 80.0% absorbed? The aluminum beaker has a mass of 30.0 grams and contains 250 grams of water. (b) Do the polarizing filters get hot? Explain.arrow_forward
- An AM radio transmitter broadcasts 50.0 kW of power uniformly in all directions. (a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what Is the intensity 30.0 km away? (Hint: Half the power will be spread over the area of a hemisphere.) (b) What is the maximum electric field strength at this distance?arrow_forwardA microscopic spherical dust particle of radius 2m and mass 10g is moving in outer space at a constant speed of 30 cm/sec. A wave of light strikes it from the opposite direction of its motion and gets absorbed. Assuming the particle decelerates uniformly to zero speed in one second, what is the average electric field amplitude in the light?arrow_forwardIntegrated Concepts (a) On a day when the intensity of sunlight is 1.00 kW/m2, a circular lens 0.200 m in diameter focuses light onto water in a black beaker. Two polarizing sheets of plastic are placed in front of the lens with their axes at an angle of 20.0°. Assuming the sunlight is un-polarized and the polarizers are 100% efficient, what is the initial rate of heating of the water in °C/s, assuming it is 80.0% absorbed? The aluminum beaker has a mass of 30.0 grams and contains 250 grams of water. (b) Do the polarizing filters get hot? Explain.arrow_forward
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