Question 1

When light in air strikes the flat surface of a certain glass at 31.2° with the normal,the reflected ray is 100 percent polarized.What is the critical angle for the air-glass interface of this glass?

Accepted Answer

A)  52.7°
B)  58.8°
C)  21.4°
D)  37.3°
E)  68.6°F) D) and E)
G) A) and C)

Question 2

A 4.4 ×  101410^{14}1014  Hz laser emits a 2.1 μs pulse that is 5.0 mm in diameter.The energy density in the beam is  0.24 J/m30.24 \mathrm {~J} / \mathrm { m } ^ { 3 }0.24 J/m3  How many wavelengths are there in the length of the beam? (c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  9.2 × 108
B)  2.8 × 109
C)  2.8 × 108
D)  9.2 × 109
E)  2.8 × 1010 F) B) and D)
G) All of the above

Question 3

The following items are positioned in sequence: A source of a beam of natural light of intensity I0,three ideal polarizers A,B,and C; and an observer.Polarizer axis angles are measured clockwise from the vertical,as viewed by the observer.The axis angle of polarizer A is set at 0° (vertical) ,and the axis angle of polarizer C is set at 50°.The axis angle of polarizer B is set at 120°.What is ratio of the intensity of the beam at the observer to the intensity I0 of the source?

Accepted Answer

A)  0.015
B)  0.020
C)  0.025
D)  0.030
E)  0.035F) C) and D)
G) A) and B)

Question 4

Three ideal polarizers are oriented as follows: The axis of the second polarizer is at an angle of 59.0° relative to the first one.The axis of the third polarizer is at an angle of 31.0° relative to the second one,so the axis of the axis of the third polarizer is perpendicular to the axis of the first one.Unpolarized light of intensity $18.6 \mathrm {~W} / \mathrm { m } ^ { 2 }$ is incident on the first polarizer.
(a)What is the intensity of the light after it passes through all three polarizers?
(b)What is the intensity of the transmitted light if the second polarizer is removed?

Accepted Answer

(a)1.81 W/...

Question 5

Which one of the following is not an electromagnetic wave?

Accepted Answer

A)  ultraviolet
B)  infrared
C)  radio waves
D)  sound waves
E)  gamma raysF) A) and B)
G) D) and E)

Question 6

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 108 m/s)

Accepted Answer

A)  19 ms
B)  4.5 ms
C)  5.3 ms
D)  13 ms
E)  19 µsF) A) and B)
G) A) and E)

Question 7

An FM radio station broadcasts at 96.7 MHz.What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 108 m/s)

Accepted Answer

Question 8

For an electromagnetic wave in free space having an  E⃗\vec { E }E  field of amplitude E1 and a  B⃗\vec { B }B  field of amplitude B1,the ratio of B1 /E1 is equal to

Accepted Answer

A)  c
B)  c2
C)  1/c
D)  1/c2
E)    c\sqrt { c}cc-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z'/>​F) A) and B)
G) A) and C)

Question 9

How long does it take light to travel 1.0 m? (c = 3.0 × 108 m/s)

Accepted Answer

A)  3.3 ns
B)  3.3 μs
C)  3.3 ms
D)  3.3 sE) A) and D)
F) A) and C)

Question 10

The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an average value of 0.601 W/m2.What is the maximum value of the  B⃗\vec { B }B  field in the wave? (c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  7.09 × 10-8 T
B)  5.02 × 10-8 T
C)  3.55 × 10-8 T
D)  9.81 × 10-8 T
E)  1.42 × 10-7 T F) A) and B)
G) A) and D)

Question 11

Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)

Accepted Answer

A)  The electric field carries more energy than the magnetic field.
B)  The electric and magnetic fields have equal amplitudes.
C)  The electric field carries the same mount of energy as the magnetic field.
D)  The frequency of the magnetic field is the same as the frequency of the electric field.
E)  The frequency of the electric field is higher than the frequency of the magnetic field.F) C) and D)
G) All of the above

Question 12

A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm.What is the lowest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)

Accepted Answer

A)  1.50 × 1014 Hz
B)  7.50 × 1013 Hz
C)  7.50 × 1014 Hz
D)  7.50 × 1015 Hz
E)  1.50 × 1015 HzF) B) and C)
G) A) and B)

Question 13

A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m.What is the maximum  B⃗\vec { B }B  field of this wave? (c = 3.0 × 108 m/s)

Accepted Answer

A)  3.4 × 10-4 T
B)  4.0 × 10-6 T
C)  2.2 × 10-5 T
D)  9.6 × 10-6 T
E)  8.7 × 10-6 T F) A) and B)
G) D) and E)

Question 14

The maximum magnetic energy density of a sinusoidal electromagnetic wave is 8.95 × 10-5 J/m3.What is the amplitude of the  B⃗\vec { B }B  field component of this wave? (c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  12.0 μT
B)  13.0 μT
C)  14.0 μT
D)  15.0 μT
E)  16.0 μT F) A) and B)
G) D) and E)

Question 15

A radio station broadcasts at 80 MHz.How long does it take for this radio signal to travel a distance of  2.0×107 m2.0 	imes 10 ^ { 7 } \mathrm {~m}2.0×107 m  through space? (c = 3.0 × 108 m/s)

Accepted Answer

A)  0.15 × 10-2 s
B)  15 ms
C)  6.7 × 10-2 s
D)  20 ms
E)  25 ms F) B) and D)
G) B) and C)

Question 16

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the  B⃗\vec { B }B  field in the laser beam? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Accepted Answer

A)  9.24 µT
B)  17.2 µT
C)  12.4 µT
D)  20.5 µT
E)  15.4 µT F) D) and E)
G) B) and E)

Question 17

About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun,which is 1.5 × 1011 m away.Use this information to estimate the average power output of the sun.

Accepted Answer

A)  1 × 1026 W
B)  2 × 1026 W
C)  3 × 1026 W
D)  4 × 1026 WE) C) and D)
F) None of the above

Question 18

An electromagnetic wave is propagating towards the west in a vacuum.At a certain moment the direction of the  B⃗\vec { B }B  field vector associated with this wave points vertically upward.What is the direction of the  E⃗\vec { E }E  field vector?

Accepted Answer

A)  horizontal and pointing south
B)  vertical and pointing down
C)  horizontal and pointing north
D)  vertical and pointing upward
E)  horizontal and pointing east F) B) and D)
G) A) and D)

Question 19

Light passes through three ideal polarizing sheets.Unpolarized light enters the first sheet and the resultant vertically polarized beam continues through the second sheet and third sheet.The second sheet has its transmission axis at 50° with respect to the first sheet,and the third sheet is at 70° with respect to the first sheet.
(a)What percent of the original intensity emerges from filter #1?
(b)What percent of the original intensity emerges from filter #2?
(c)What percent of the original intensity emerges from filter #3?

Accepted Answer

(a)50%
(b...

Question 20

Unpolarized light passes through a combination of two ideal polarizers.The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other.What percentage of the original light gets through the combination?

Accepted Answer

A)  37.5%
B)  50%
C)  75%
D)  100%E) B) and C)
F) A) and D)

Exam 25: Electromagnetic Waves

An electromagnetic wave is propagating towards the west in a vacuum.At a certain moment the direction of the $\vec { B }$ field vector associated with this wave points vertically upward.What is the direction of the $\vec { E }$ field vector?

Correct Answer
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The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an average value of 0.601 W/m².What is the maximum value of the $\vec { B }$ field in the wave? (c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Correct Answer
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Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)

Correct Answer
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Correct Answer
verified
(a)1.81 W/...
View Answer

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 10⁸ m/s)

Correct Answer
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Which one of the following is not an electromagnetic wave?

Correct Answer
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An FM radio station broadcasts at 96.7 MHz.What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 10⁸ m/s)

Correct Answer
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Unpolarized light passes through a combination of two ideal polarizers.The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other.What percentage of the original light gets through the combination?

Correct Answer
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How long does it take light to travel 1.0 m? (c = 3.0 × 10⁸ m/s)

Correct Answer
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Correct Answer
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(a)50%
(b...
View Answer

The maximum magnetic energy density of a sinusoidal electromagnetic wave is 8.95 × 10^-5 J/m³.What is the amplitude of the $\vec { B }$ field component of this wave? (c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Correct Answer
verified

About 1350 W/m² of electromagnetic energy reaches the upper atmosphere of the earth from the sun,which is 1.5 × 10¹¹ m away.Use this information to estimate the average power output of the sun.

Correct Answer
verified

A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m.What is the maximum $\vec { B }$ field of this wave? (c = 3.0 × 10⁸ m/s)

Correct Answer
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A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm.What is the lowest frequency associated with this portion of the spectrum? (c = 3.00 × 10⁸ m/s)

Correct Answer
verified

For an electromagnetic wave in free space having an $\vec { E }$ field of amplitude E₁ and a $\vec { B }$ field of amplitude B₁,the ratio of B₁/E₁ is equal to

Correct Answer
verified

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the $\vec { B }$ field in the laser beam? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

Correct Answer
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Correct Answer
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Correct Answer
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A radio station broadcasts at 80 MHz.How long does it take for this radio signal to travel a distance of $2.0 \times 10 ^ { 7 } \mathrm {~m}$ through space? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

When light in air strikes the flat surface of a certain glass at 31.2° with the normal,the reflected ray is 100 percent polarized.What is the critical angle for the air-glass interface of this glass?

Correct Answer
verified

Exam 25: Electromagnetic Waves

An electromagnetic wave is propagating towards the west in a vacuum.At a certain moment the direction of the B⃗\vec { B }B field vector associated with this wave points vertically upward.What is the direction of the E⃗\vec { E }E field vector?

Correct AnswerverifiedShow Answer

The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an average value of 0.601 W/m2.What is the maximum value of the B⃗\vec { B }B field in the wave? (c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Correct AnswerverifiedShow Answer

Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

Correct Answerverified(a)1.81 W/...View AnswerShow Answer

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

Which one of the following is not an electromagnetic wave?

Correct AnswerverifiedShow Answer

An FM radio station broadcasts at 96.7 MHz.What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

Unpolarized light passes through a combination of two ideal polarizers.The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other.What percentage of the original light gets through the combination?

Correct AnswerverifiedShow Answer

How long does it take light to travel 1.0 m? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

Correct Answerverified(a)50% (b...View AnswerShow Answer

The maximum magnetic energy density of a sinusoidal electromagnetic wave is 8.95 × 10-5 J/m3.What is the amplitude of the B⃗\vec { B }B field component of this wave? (c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Correct AnswerverifiedShow Answer

About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun,which is 1.5 × 1011 m away.Use this information to estimate the average power output of the sun.

Correct AnswerverifiedShow Answer

A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m.What is the maximum B⃗\vec { B }B field of this wave? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm.What is the lowest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)

Correct AnswerverifiedShow Answer

For an electromagnetic wave in free space having an E⃗\vec { E }E field of amplitude E1 and a B⃗\vec { B }B field of amplitude B1,the ratio of B1 /E1 is equal to

Correct AnswerverifiedShow Answer

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the B⃗\vec { B }B field in the laser beam? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A radio station broadcasts at 80 MHz.How long does it take for this radio signal to travel a distance of 2.0×107 m2.0 \times 10 ^ { 7 } \mathrm {~m}2.0×107 m through space? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

When light in air strikes the flat surface of a certain glass at 31.2° with the normal,the reflected ray is 100 percent polarized.What is the critical angle for the air-glass interface of this glass?

Correct AnswerverifiedShow Answer

An electromagnetic wave is propagating towards the west in a vacuum.At a certain moment the direction of the $\vec { B }$ field vector associated with this wave points vertically upward.What is the direction of the $\vec { E }$ field vector?

Correct Answer
verified

The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an average value of 0.601 W/m².What is the maximum value of the $\vec { B }$ field in the wave? (c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a)1.81 W/...
View Answer

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 10⁸ m/s)

Correct Answer
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Correct Answer
verified

An FM radio station broadcasts at 96.7 MHz.What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

How long does it take light to travel 1.0 m? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified
(a)50%
(b...
View Answer

The maximum magnetic energy density of a sinusoidal electromagnetic wave is 8.95 × 10^-5 J/m³.What is the amplitude of the $\vec { B }$ field component of this wave? (c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Correct Answer
verified

About 1350 W/m² of electromagnetic energy reaches the upper atmosphere of the earth from the sun,which is 1.5 × 10¹¹ m away.Use this information to estimate the average power output of the sun.

Correct Answer
verified

A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m.What is the maximum $\vec { B }$ field of this wave? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm.What is the lowest frequency associated with this portion of the spectrum? (c = 3.00 × 10⁸ m/s)

Correct Answer
verified

For an electromagnetic wave in free space having an $\vec { E }$ field of amplitude E₁ and a $\vec { B }$ field of amplitude B₁,the ratio of B₁/E₁ is equal to

Correct Answer
verified

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the $\vec { B }$ field in the laser beam? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

Correct Answer
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Correct Answer
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Correct Answer
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A radio station broadcasts at 80 MHz.How long does it take for this radio signal to travel a distance of $2.0 \times 10 ^ { 7 } \mathrm {~m}$ through space? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
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