Question 1

Which one of the following statements concerning electromagnetic waves is false?

Accepted Answer

A)  Electromagnetic waves are longitudinal waves.
B)  Electromagnetic waves transfer energy through space.
C)  The existence of electromagnetic waves was predicted by Maxwell.
D)  Electromagnetic waves can propagate through a material substance.
E)  Electromagnetic waves do not require a physical medium for propagation.F) A) and C)
G) C) and D)

Question 2

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10-8 T. The frequency of the wave is 1.0 × 1016 Hz. -8 T. The frequency of the wave is 1.0 × 1016 Hz.   -What is the rms value of the magnetic field? Assume that the figure shows the peak value of   . A) 1.0 × 10-8 T B) 1.4 × 10-8 T C) 2.8 × 10-8 T D) 4.6 × 10-8 T E) 5.7 × 10-8 T" class="answers-bank-image d-inline" rel="preload" >
-What is the rms value of the magnetic field? Assume that the figure shows the peak value of -8 T. The frequency of the wave is 1.0 × 1016 Hz.   -What is the rms value of the magnetic field? Assume that the figure shows the peak value of   . A) 1.0 × 10-8 T B) 1.4 × 10-8 T C) 2.8 × 10-8 T D) 4.6 × 10-8 T E) 5.7 × 10-8 T" class="answers-bank-image d-inline" rel="preload" > .

Accepted Answer

A)  1.0 × 10-8 T
B)  1.4 × 10-8 T
C)  2.8 × 10-8 T
D)  4.6 × 10-8 T
E)  5.7 × 10-8 TF) C) and D)
G) None of the above

Question 3

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. 
-Determine the rms value of the electric field magnitude.

Accepted Answer

A)  7.1 N/C
B)  12 N/C
C)  14 N/C
D)  19 N/C
E)  28 N/CF) C) and D)
G) A) and D)

Question 4

When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?

Accepted Answer

A)  7.1 × 1010 Hz
B)  2.1 × 1014 Hz
C)  3.0 × 108 Hz
D)  6.9 × 1011 Hz
E)  1.4 × 109 HzF) B) and D)
G) A) and B)

Question 5

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -8 T B) 2.3 × 10-8 T C) 3.3 × 10-8 T D) 4.6 × 10-8 T E) 5.4 × 10-8 T" class="answers-bank-image d-inline" rel="preload" >
-What is the peak value of the magnetic field?

Accepted Answer

A)  1.4 × 10-8 T
B)  2.3 × 10-8 T
C)  3.3 × 10-8 T
D)  4.6 × 10-8 T
E)  5.4 × 10-8 TF) A) and C)
G) B) and E)

Question 6

Unpolarized light with an average intensity of 845 W/m2 enters a polarizer with a vertical transmission axis. The transmitted light then enters a second polarizer. The light that exits the second polarizer is found to have an average intensity of 225 W/m2. What is the orientation angle of the second polarizer relative to the first one?

Accepted Answer

A)  54.7°
B)  22.6°
C)  43.1°
D)  77.3°
E)  zero degreesF) A) and C)
G) C) and E)

Question 7

An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10-7 H inductor and a variable capacitor set at 7.31 × 10-12 F. What is the frequency of the radio wave?

Accepted Answer

A)  1.02 × 108 Hz
B)  8.80 × 107 Hz
C)  1.58 × 108 Hz
D)  9.40 × 107 Hz
E)  9.80 × 107 HzF) C) and D)
G) B) and D)

Question 8

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10-8 T. The frequency of the wave is 1.0 × 1016 Hz. -8 T. The frequency of the wave is 1.0 × 1016 Hz.   -What is the wavelength of this electromagnetic wave? A) 0.33 nm B) 3.3 nm C) 20 nm D) 30 nm E) 40 nm" class="answers-bank-image d-inline" rel="preload" >
-What is the wavelength of this electromagnetic wave?

Accepted Answer

A)  0.33 nm
B)  3.3 nm
C)  20 nm
D)  30 nm
E)  40 nmF) C) and D)
G) All of the above

Question 9

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10-8 T. The frequency of the wave is 1.0 × 1016 Hz. -8 T. The frequency of the wave is 1.0 × 1016 Hz.   -What is the direction of polarization of this electromagnetic wave? A) the x direction B) the y direction C) the z direction D) 45° with respect to the x direction E) the wave is not polarized" class="answers-bank-image d-inline" rel="preload" >
-What is the direction of polarization of this electromagnetic wave?

Accepted Answer

A)  the x direction
B)  the y direction
C)  the z direction
D)  45° with respect to the x direction
E)  the wave is not polarizedF) C) and D)
G) C) and E)

Question 10

Which one of the following colors of visible light has the highest frequency?

Accepted Answer

A)  yellow
B)  red
C)  green
D)  blue
E)  violetF) A) and C)
G) A) and E) E

Question 11

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -10 s? A) 2.0 N/C B) 5.0 N/C C) 7.1 N/C D) 10.0 N/C E) zero N/C" class="answers-bank-image d-inline" rel="preload" >
-What is the magnitude of the electric field at t = 3.34 × 10-10 s?

Accepted Answer

A)  2.0 N/C
B)  5.0 N/C
C)  7.1 N/C
D)  10.0 N/C
E)  zero N/CF) A) and B)
G) B) and C)

Question 12

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. 
-To which region of the electromagnetic spectrum does this wave belong?

Accepted Answer

A)  X-rays
B)  gamma rays
C)  visible light
D)  infrared radiation
E)  radio wavesF) A) and B)
G) A) and C) E

Question 13

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10-8 T. The frequency of the wave is 1.0 × 1016 Hz. -8 T. The frequency of the wave is 1.0 × 1016 Hz.   -What is the direction of electromagnetic energy transport? A) the positive x direction B) the negative x direction C) the positive y direction D) the negative y direction E) the negative z direction" class="answers-bank-image d-inline" rel="preload" >
-What is the direction of electromagnetic energy transport?

Accepted Answer

A)  the positive x direction
B)  the negative x direction
C)  the positive y direction
D)  the negative y direction
E)  the negative z directionF) B) and E)
G) A) and B)

Question 14

Linearly polarized light is incident upon a polarizing sheet that has a transmission axis is parallel to the incident light. The sheet is rotated about its axis through 360° (one complete revolution) . At how many positions, including the initial and final positions, will the transmitted intensity be a maximum?

Accepted Answer

A)  6
B)  5
C)  4
D)  3
E)  2F) A) and B)
G) A) and C)

Question 15

The average distance between the surface of the earth and the surface of the sun is 1.49 × 1011 m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

Accepted Answer

A)  zero minutes
B)  2.9 × 10-3 min
C)  8.3 min
D)  74 min
E)  500 minF) A) and E)
G) C) and D)

Question 16

Which one of the following wavelengths is in the infrared range of the electromagnetic spectrum?

Accepted Answer

A)  100 mm
B)  400 nm
C)  400 m
D)  2 × 10-15 m
E)  20 µmF) B) and C)
G) D) and E)

Question 17

Which one of the following scientists did not attempt to measure the speed of light?

Accepted Answer

A)  Galileo
B)  Maxwell
C)  Fizeau
D)  Foucault
E)  MichelsonF) B) and D)
G) A) and D)

Question 18

Linearly polarized light is incident of a sheet of polarizing material. The angle between the transmission axis and the incident electric field is 44°. What percentage of the incident intensity is transmitted?

Accepted Answer

A)  38 %
B)  43 %
C)  52 %
D)  72 %
E)  84 %F) A) and B)
G) A) and C)

Question 19

A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 104 W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

Accepted Answer

A)  1.49 × 10-5 W/m2 
B)  5.96 × 10-5 W/m2 
C)  3.73 × 10-6 W/m2
D)  1.17 × 10-7 W/m2
E)  5.60 × 10-8 W/m2F) C) and D)
G) None of the above A

Question 20

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction) . At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10-8 T. The frequency of the wave is 1.0 × 1016 Hz. -8 T. The frequency of the wave is 1.0 × 1016 Hz.   -What is the direction of the electric field? A) It points in the negative y direction. B) It points in the positive y direction. C) It points in the negative z direction. D) It points in the negative x direction. E) It points in the positive x direction." class="answers-bank-image d-inline" rel="preload" >
-What is the direction of the electric field?

Accepted Answer

A)  It points in the negative y direction.
B)  It points in the positive y direction.
C)  It points in the negative z direction.
D)  It points in the negative x direction.
E)  It points in the positive x direction.F) B) and C)
G) B) and E)

Exam 24: Electromagnetic Waves

Which one of the following statements concerning electromagnetic waves is false?

Correct Answer
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Correct Answer
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The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -Determine the rms value of the electric field magnitude.

Correct Answer
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When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?

Correct Answer
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The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the peak value of the magnetic field?

Correct Answer
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Correct Answer
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An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10^-⁷H inductor and a variable capacitor set at 7.31 × 10^-¹² F. What is the frequency of the radio wave?

Correct Answer
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Correct Answer
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Correct Answer
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Which one of the following colors of visible light has the highest frequency?

Correct Answer
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E

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the magnitude of the electric field at t = 3.34 × 10^-¹⁰ s?

Correct Answer
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The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -To which region of the electromagnetic spectrum does this wave belong?

Correct Answer
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E

Correct Answer
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Correct Answer
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The average distance between the surface of the earth and the surface of the sun is 1.49 × 10¹¹ m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

Correct Answer
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Which one of the following wavelengths is in the infrared range of the electromagnetic spectrum?

Correct Answer
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Which one of the following scientists did not attempt to measure the speed of light?

Correct Answer
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Linearly polarized light is incident of a sheet of polarizing material. The angle between the transmission axis and the incident electric field is 44°. What percentage of the incident intensity is transmitted?

Correct Answer
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A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 10⁴ W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

Correct Answer
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A

Correct Answer
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Exam 24: Electromagnetic Waves

Which one of the following statements concerning electromagnetic waves is false?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -Determine the rms value of the electric field magnitude.

Correct AnswerverifiedShow Answer

When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?

Correct AnswerverifiedShow Answer

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the peak value of the magnetic field?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10-7 H inductor and a variable capacitor set at 7.31 × 10-12 F. What is the frequency of the radio wave?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which one of the following colors of visible light has the highest frequency?

Correct AnswerverifiedE

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the magnitude of the electric field at t = 3.34 × 10-10 s?

Correct AnswerverifiedShow Answer

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -To which region of the electromagnetic spectrum does this wave belong?

Correct AnswerverifiedE

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The average distance between the surface of the earth and the surface of the sun is 1.49 × 1011 m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

Correct AnswerverifiedShow Answer

Which one of the following wavelengths is in the infrared range of the electromagnetic spectrum?

Correct AnswerverifiedShow Answer

Which one of the following scientists did not attempt to measure the speed of light?

Correct AnswerverifiedShow Answer

Linearly polarized light is incident of a sheet of polarizing material. The angle between the transmission axis and the incident electric field is 44°. What percentage of the incident intensity is transmitted?

Correct AnswerverifiedShow Answer

A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 104 W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

Correct AnswerverifiedA

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10^-⁷H inductor and a variable capacitor set at 7.31 × 10^-¹² F. What is the frequency of the radio wave?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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E

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the magnitude of the electric field at t = 3.34 × 10^-¹⁰ s?

Correct Answer
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Correct Answer
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E

Correct Answer
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Correct Answer
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The average distance between the surface of the earth and the surface of the sun is 1.49 × 10¹¹ m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 10⁴ W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

Correct Answer
verified
A

Correct Answer
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