Question 1

A sinusoidal electromagnetic wave has a peak electric field of 2 B) 85 kW/m2 C) 21 kW/m2 D) 11 kW/m2" class="answers-bank-image d-inline" rel="preload" >
What is the intensity of the wave? 2 B) 85 kW/m2 C) 21 kW/m2 D) 11 kW/m2" class="answers-bank-image d-inline" rel="preload" >
2 B) 85 kW/m2 C) 21 kW/m2 D) 11 kW/m2" class="answers-bank-image d-inline" rel="preload" >
2 B) 85 kW/m2 C) 21 kW/m2 D) 11 kW/m2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  170 kW/m2
B)  85 kW/m2
C)  21 kW/m2
D)  11 kW/m2E) A) and D)
F) B) and D)

Question 2

What is the frequency of 20-mm microwaves? (c = 3.0 × 108 m/s)

Accepted Answer

A)  100 MHz
B)  400 MHz
C)  15 GHz
D)  73 GHzE) A) and B)
F) A) and C)

Question 3

What is the maximum value of the magnetic field at a distance of 2.5 m from a light bulb that radiates 100 W of single-frequency sinusoidal electromagnetic waves uniformly in all directions? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Accepted Answer

A)  0.10 μT
B)  0.40 μT
C)  0.50 μT
D)  0.60 μT
E)  0.80 μTF) None of the above
G) B) and C)

Question 4

An electromagnetic wave travels in free space in the +y direction,as shown in the figure.If the electric field at the origin is along the +z direction,what is the direction of the magnetic field?

Accepted Answer

A)  +z
B)  -z
C)  +y
D)  +x
E)  -xF) C) and E)
G) None of the above

Question 5

For a certain electromagnetic wave in free space,at one instant the electric field vector points in the +z direction while the magnetic field vector points in the +x direction,as shown in the figure.In what direction is this wave traveling?

Accepted Answer

A)  +x
B)  -x
C)  +y
D)  -y
E)  +zF) A) and D)
G) A) and C)

Question 6

A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket.How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)

Accepted Answer

A)  2400 km
B)  1200 km
C)  1800 km
D)  3600 km
E)  4800 kmF) C) and D)
G) A) and B)

Question 7

A beam of light is polarized in a vertical plane and has an intensity I0.The beam passes through an ideal polarizer and then through an ideal analyzer whose axis is set horizontally.If the axis of the polarizer is set at 60° with the vertical,what is the ratio of the intensity of the final beam to I0?

Accepted Answer

A)  0.19
B)  0.25
C)  0.31
D)  0.37
E)  0.43F) All of the above
G) B) and C)

Question 8

An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m2.After passing through the polarizer,what is intensity of the beam?

Accepted Answer

A)  2.5 W/m2
B)  5.0 W/m2
C)  8.7 W/m2
D)  7.5 W/m2
E)  10 W/m2F) A) and E)
G) C) and E)

Question 9

A radiometer has two square vanes (1.0 cm by 1.0 cm) ,attached to a light horizontal cross arm,and pivoted about a vertical axis through the center,as shown in the figure.The center of each vane is 6.0 cm from the axis.One vane is silvered and it reflects all radiant energy that falls upon it.The other vane is blackened and it absorbs all incident radiant energy.Radiant energy,having an intensity of 300 W/m2,is incident normally upon the front surfaces of both vanes.What is the radiant power absorbed by the blackened vane? 2,is incident normally upon the front surfaces of both vanes.What is the radiant power absorbed by the blackened vane?   A) 0.030 W B) 0.040 W C) 0.050 W D) 0.060 W E) 0.090 W" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.030 W
B)  0.040 W
C)  0.050 W
D)  0.060 W
E)  0.090 WF) B) and C)
G) None of the above

Question 10

The amplitude of the electric field for a certain type of electromagnetic wave is 570 N/C.What is the amplitude of the magnetic field for that wave? (c = 3.00 × 108 m/s)

Accepted Answer

A)  2.91 µT
B)  1.90 µT
C)  1.10 µT
D)  1.41 µT
E)  2.41 µTF) A) and D)
G) B) and D)

Question 11

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) A) and B)
F) All of the above

Question 12

An 800-kHz sinusoidal radio signal is detected at a point 6.6 km from the transmitter tower.The electric field amplitude of the signal at that point is 0.780 V/m.Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed.What is the amplitude of the magnetic field of the signal at that point? (ε0 = 8.85 × 10-12 C2/N ∙ m2,c = 3.0 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A)

Accepted Answer

A)  2.6 nT
B)  2.1 nT
C)  1.6 nT
D)  3.1 nT
E)  3.6 nTF) B) and E)
G) B) and C)

Question 13

The wavelength of an electromagnetic wave is 600 nm.What is its frequency? (c = 3.0 × 108 m/s)

Accepted Answer

A)  200 × 1012 Hz
B)  300 × 1012 Hz
C)  400 × 1012 Hz
D)  500 × 1012 Hz
E)  600 × 1012 HzF) C) and D)
G) A) and D)

Question 14

How far does a beam of light travel through space in one 365-day year? (c = 3.0 × 108 m/s)

Accepted Answer

A)  80 × 1012 m
B)  95 × 1014 m
C)  30 × 108 m
D)  20 × 1015 m
E)  36 × 1016 mF) A) and C)
G) A) and D)

Question 15

Unpolarized light is incident upon two ideal polarizing filters that do not have their transmission axes aligned.If 19% Of the light passes through this combination,what is the angle between the transmission axes of the two filters?

Accepted Answer

A)  52°
B)  72°
C)  0°
D)  0°..E) A) and B)
F) A) and C)

Question 16

A vertically polarized beam of light of intensity 100 W/m2 passes through two ideal polarizers.The transmission axis of the first polarizer makes an angle of 20.0° with the vertical,and the transmission axis of the second one makes an angle of 40.0° with the vertical.What is the intensity of the light after it has passes through both polarizers?

Accepted Answer

A)  22.2 W/m2
B)  44.4 W/m2
C)  66.6 W/m2
D)  78.0 W/m2
E)  11.7 W/m2F) A) and B)
G) C) and D)

Question 17

At a certain instant in time,the electric field of an electromagnetic wave in free space points in the -z direction,and the magnetic field points in the +y direction.In what direction is this wave traveling?

Accepted Answer

A)  +x direction
B)  -x direction
C)  +y direction
D)  -z direction
E)  +z directionF) A) and B)
G) None of the above

Question 18

Light of intensity S0 that is polarized horizontally passes through three ideal polarizers.The first and third are horizontal,but the second one is oriented at 0 that is polarized horizontally passes through three ideal polarizers.The first and third are horizontal,but the second one is oriented at   To the horizontal.In terms of S0,the intensity of the light that passes through the set of polarizers is closest to which one of the following choices? A) 0.729 S0 B) 0.125 S0 C) 0.427 S0 D) 0.854 S0" class="answers-bank-image d-inline" rel="preload" >
To the horizontal.In terms of S0,the intensity of the light that passes through the set of polarizers is closest to which one of the following choices?

Accepted Answer

A)  0.729 S0
B)  0.125 S0
C)  0.427 S0
D)  0.854 S0E) A) and D)
F) A) and C)

Question 19

An electromagnetic wave is propagating towards the west in free space.At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward.What is the direction of the electric 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 eastF) A) and B)
G) A) and C)

Question 20

How much energy is transported across a 1.00-cm2 area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Accepted Answer

A)  0.44 nJ
B)  0.44 μJ
C)  0.44 mJ
D)  0.44 JE) A) and C)
F) B) and C)

Exam 25: Electromagnetic Waves

What is the maximum value of the magnetic field at a distance of 2.5 m from a light bulb that radiates 100 W of single-frequency sinusoidal electromagnetic waves uniformly in all directions? (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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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
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Correct Answer
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An electromagnetic wave is propagating towards the west in free space.At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward.What is the direction of the electric field vector?

Correct Answer
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What is the frequency of 20-mm microwaves? (c = 3.0 × 10⁸ m/s)

Correct Answer
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The amplitude of the electric field for a certain type of electromagnetic wave is 570 N/C.What is the amplitude of the magnetic field for that wave? (c = 3.00 × 10⁸ m/s)

Correct Answer
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Correct Answer
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Unpolarized light is incident upon two ideal polarizing filters that do not have their transmission axes aligned.If 19% Of the light passes through this combination,what is the angle between the transmission axes of the two filters?

Correct Answer
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At a certain instant in time,the electric field of an electromagnetic wave in free space points in the -z direction,and the magnetic field points in the +y direction.In what direction is this wave traveling?

Correct Answer
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For a certain electromagnetic wave in free space,at one instant the electric field vector points in the +z direction while the magnetic field vector points in the +x direction,as shown in the figure.In what direction is this wave traveling?

Correct Answer
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Correct Answer
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How much energy is transported across a 1.00-cm² area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

Correct Answer
verified

An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m².After passing through the polarizer,what is intensity of the beam?

Correct Answer
verified

A sinusoidal electromagnetic wave has a peak electric field of What is the intensity of the wave?

Correct Answer
verified

A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket.How far is the rocket from this planet's surface? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

How far does a beam of light travel through space in one 365-day year? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

The wavelength of an electromagnetic wave is 600 nm.What is its frequency? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

An electromagnetic wave travels in free space in the +y direction,as shown in the figure.If the electric field at the origin is along the +z direction,what is the direction of the magnetic field?

Correct Answer
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Correct Answer
verified

Exam 25: Electromagnetic Waves

What is the maximum value of the magnetic field at a distance of 2.5 m from a light bulb that radiates 100 W of single-frequency sinusoidal electromagnetic waves uniformly in all directions? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

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

Correct AnswerverifiedShow Answer

An electromagnetic wave is propagating towards the west in free space.At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward.What is the direction of the electric field vector?

Correct AnswerverifiedShow Answer

What is the frequency of 20-mm microwaves? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

The amplitude of the electric field for a certain type of electromagnetic wave is 570 N/C.What is the amplitude of the magnetic field for that wave? (c = 3.00 × 108 m/s)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Unpolarized light is incident upon two ideal polarizing filters that do not have their transmission axes aligned.If 19% Of the light passes through this combination,what is the angle between the transmission axes of the two filters?

Correct AnswerverifiedShow Answer

At a certain instant in time,the electric field of an electromagnetic wave in free space points in the -z direction,and the magnetic field points in the +y direction.In what direction is this wave traveling?

Correct AnswerverifiedShow Answer

For a certain electromagnetic wave in free space,at one instant the electric field vector points in the +z direction while the magnetic field vector points in the +x direction,as shown in the figure.In what direction is this wave traveling?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How much energy is transported across a 1.00-cm2 area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m2.After passing through the polarizer,what is intensity of the beam?

Correct AnswerverifiedShow Answer

A sinusoidal electromagnetic wave has a peak electric field of What is the intensity of the wave?

Correct AnswerverifiedShow Answer

A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket.How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

How far does a beam of light travel through space in one 365-day year? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The wavelength of an electromagnetic wave is 600 nm.What is its frequency? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

An electromagnetic wave travels in free space in the +y direction,as shown in the figure.If the electric field at the origin is along the +z direction,what is the direction of the magnetic field?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the maximum value of the magnetic field at a distance of 2.5 m from a light bulb that radiates 100 W of single-frequency sinusoidal electromagnetic waves uniformly in all directions? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

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

Correct Answer
verified

Correct Answer
verified

What is the frequency of 20-mm microwaves? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

The amplitude of the electric field for a certain type of electromagnetic wave is 570 N/C.What is the amplitude of the magnetic field for that wave? (c = 3.00 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How much energy is transported across a 1.00-cm² area per hour by a sinusoidal electromagnetic wave whose electric field has a maximum strength of 30.4 V/m? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

Correct Answer
verified

An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m².After passing through the polarizer,what is intensity of the beam?

Correct Answer
verified

Correct Answer
verified

A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket.How far is the rocket from this planet's surface? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

How far does a beam of light travel through space in one 365-day year? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

The wavelength of an electromagnetic wave is 600 nm.What is its frequency? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

Correct Answer
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