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

A) 100 MHz B) 400 MHz C) 15 GHz D) 73 GHz A) 100 MHz B) 400 MHz C) 15 GHz D) 73 GHz

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.

A) 1 × 1026 W B) 2 × 1026 W C) 3 × 1026 W D) 4 × 1026 W A) 1 × 1026 W B) 2 × 1026 W C) 3 × 1026 W D) 4 × 1026 W

Exam 25: Electromagnetic Waves

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?

(Multiple Choice)

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Question 21

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?

(Multiple Choice)

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Question 22

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?

(Multiple Choice)

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Question 23

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)

(Multiple Choice)

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Question 24

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?

(Multiple Choice)

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Question 25

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?

(Multiple Choice)

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Question 26

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

(Multiple Choice)

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Question 27

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?

(Multiple Choice)

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Question 28

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?

(Multiple Choice)

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Question 29

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?

(Multiple Choice)

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Question 30

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?

(Multiple Choice)

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Question 31

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)

(Multiple Choice)

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Question 32

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

(Multiple Choice)

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Question 33

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 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?

(Multiple Choice)

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Question 34

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.

(Multiple Choice)

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Question 35

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)

(Multiple Choice)

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Question 36

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

(Multiple Choice)

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Question 37

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

(Multiple Choice)

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Question 38

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)

(Multiple Choice)

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Question 39

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)

(Multiple Choice)

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Question 40

Showing 21 - 40 of 63

Exam 25: Electromagnetic Waves

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?

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?

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?

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)

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?

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?

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

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?

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)

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

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.

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)

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

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

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)

Introduction to Physics

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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)

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?

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

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)

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

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.

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)

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

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)