Question 1

If the amplitude of the electric field in a plane electromagnetic wave is 100 V/m then the amplitude of the magnetic field is:

Accepted Answer

A) 3.3 *10-7 T 
B) 6.7 * 10-7 T 
C) 0.27 T 
D) 8.0 * 107 T 
E) 3.0* 1010 T 
A) 3.3 *10-7 T 
B) 6.7 * 10-7 T 
C) 0.27 T 
D) 8.0 * 107 T 
E) 3.0* 1010 T

Question 2

An electromagnetic wave is traveling in the positive x direction with its electric field along the z axis and its magnetic field along the y axis.The fields are related by:

Accepted Answer

A)   
B)   
C)   
D)   
E)   
A)   
B)   
C)   
D)   
E)

Question 3

The relation $\theta$incident = $\theta$reflected, which applies as a ray of light strikes an interface between two media, is known as:

Accepted Answer

A) Faraday's law 
B) Snell's law 
C) Ampere's law 
D) Cole's law 
E) none of these 
A) Faraday's law 
B) Snell's law 
C) Ampere's law 
D) Cole's law 
E) none of these

Question 4

Light with an intensity of 1 kW/m2 falls normally on a surface with an area of 1 cm2 and is completely reflected.The force of the radiation on the surface is:

Accepted Answer

A) 3.3 *10-11 N 
B) 1.7 * 10-10 N 
C) 3.3 * 10-10 N 
D) 6.7 *10-10 N 
E) 1.0 * 10-4 N 
A) 3.3 *10-11 N 
B) 1.7 * 10-10 N 
C) 3.3 * 10-10 N 
D) 6.7 *10-10 N 
E) 1.0 * 10-4 N

Question 5

The illustration shows total internal reflection taking place in a piece of glass.The index of refraction of this glass:

Accepted Answer

A) is at least 2.0 
B) is at most 2.0 
C) is at least 1.15 
D) is at most 1.15 
E) cannot be calculated from the given data 
A) is at least 2.0 
B) is at most 2.0 
C) is at least 1.15 
D) is at most 1.15 
E) cannot be calculated from the given data

Question 6

An electromagnetic wave is transporting energy in the negative y direction.At one point and one instant the magnetic field is in the positive x direction.The electric field at that point and instant is:

Accepted Answer

A) positive y direction 
B) negative y direction 
C) positive z direction 
D) negative z direction 
E) negative x direction 
A) positive y direction 
B) negative y direction 
C) positive z direction 
D) negative z direction 
E) negative x direction

Question 7

Which of the following is NOT true for electromagnetic waves?

Accepted Answer

A) they consist of changing electric and magnetic fields 
B) they travel at different speeds in vacuum, depending on their frequency 
C) they transport energy 
D) they transport momentum 
E) they can be reflected 
A) they consist of changing electric and magnetic fields 
B) they travel at different speeds in vacuum, depending on their frequency 
C) they transport energy 
D) they transport momentum 
E) they can be reflected

Question 8

Radio waves of wavelength 300 m have a frequency of:

Accepted Answer

A) 10-6 kHz 
B) 108 kHz 
C) 500 kHz 
D) 1 MHz 
E) 9 MHz 
A) 10-6 kHz 
B) 108 kHz 
C) 500 kHz 
D) 1 MHz 
E) 9 MHz

Question 9

In a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is:

Accepted Answer

A) the speed of light 
B) an increasing function of frequency 
C) a decreasing function of frequency 
D)    
E) 1/   
A) the speed of light 
B) an increasing function of frequency 
C) a decreasing function of frequency 
D)    
E) 1/

Question 10

As light goes from one medium to another, it is bent away from the normal.Then:

Accepted Answer

A) the speed of the light has increased 
B) dispersion must occur 
C) the second medium has a higher index of refraction 
D) no change in speed has occurred 
E) refraction has not occurred because refraction means a bending toward the normal 
A) the speed of the light has increased 
B) dispersion must occur 
C) the second medium has a higher index of refraction 
D) no change in speed has occurred 
E) refraction has not occurred because refraction means a bending toward the normal

Question 11

A vertical automobile radio antenna is sensitive to electric fields that are polarized:

Accepted Answer

A) horizontally 
B) in circles around the antenna 
C) vertically 
D) normal to the antenna in the forward direction 
E) none of the above 
A) horizontally 
B) in circles around the antenna 
C) vertically 
D) normal to the antenna in the forward direction 
E) none of the above

Question 12

A sinusoidal electromagnetic wave with an electric field amplitude of 100 V/m is incident normally on a surface with an area of 1 cm2 and is completely absorbed.The energy absorbed in 10 s is:

Accepted Answer

A) 1.3 mJ 
B) 13 mJ 
C) 27 mJ 
D) 130 mJ 
E) 270 mJ 
A) 1.3 mJ 
B) 13 mJ 
C) 27 mJ 
D) 130 mJ 
E) 270 mJ

Question 13

Evidence that electromagnetic waves carry momentum is:

Accepted Answer

A) the tail of a comet points away from the sun 
B) electron flow through a wire generates heat 
C) a charged particle in a magnetic field moves in a circular orbit 
D) heat can be generated by rubbing two sticks together 
E) the Doppler effect 
A) the tail of a comet points away from the sun 
B) electron flow through a wire generates heat 
C) a charged particle in a magnetic field moves in a circular orbit 
D) heat can be generated by rubbing two sticks together 
E) the Doppler effect

Question 14

Maxwell's equations predict that the speed of electromagnetic waves in free space is given by:

Accepted Answer

A) µ0ε0 
B) (µ0ε0)1/2 
C) 1/ µ0ε0 
D) 1/(µ0ε0)1/2 
E) 1/(µ0ε0)2 
A) µ0ε0 
B) (µ0ε0)1/2 
C) 1/ µ0ε0 
D) 1/(µ0ε0)1/2 
E) 1/(µ0ε0)2

Question 15

A ray of light passes obliquely through a plate of glass having parallel faces.The emerging ray:

Accepted Answer

A) is totally internally reflected 
B) is bent more toward the normal than the incident ray 
C) is bent further away from the normal than the incident ray 
D) is parallel to the incident ray but displaced sideways 
E) lies on the same straight line as the incident ray 
A) is totally internally reflected 
B) is bent more toward the normal than the incident ray 
C) is bent further away from the normal than the incident ray 
D) is parallel to the incident ray but displaced sideways 
E) lies on the same straight line as the incident ray

Question 16

The magnetic field in a sinusoidal light wave has an amplitude of 3.3 *10-7 T.The intensity of the wave is:

Accepted Answer

A) 1.7* 10-4 W/m2 
B) 13 W/m2 
C) 27 W/m2 
D) 1.0 *105 W/m2 
E) 4.0 *1010 W/m2 
A) 1.7* 10-4 W/m2 
B) 13 W/m2 
C) 27 W/m2 
D) 1.0 *105 W/m2 
E) 4.0 *1010 W/m2

Question 17

Three polarizing sheets are placed in a stack with the polarizing directions of the first and third perpendicular to each other.Which of the following angles should the polarizing direction of the middle sheet make with the polarizing direction of the first sheet to obtain zero transmitted intensity when unpolarized light is incident on the stack?

Accepted Answer

A) 0° 
B) 30° 
C) 45° 
D) 60° 
E) all angles allow light to pass through 
A) 0° 
B) 30° 
C) 45° 
D) 60° 
E) all angles allow light to pass through

Question 18

At a certain point and a certain time the electric field of an electromagnetic wave is in the negative z direction and the magnetic field is in the positive y direction.Which of the following statements is true?

Accepted Answer

A) Energy is being transported in the positive x direction but half a cycle later, when the electric field is in the opposite direction, it will be transported in the negative x direction. 
B) Energy is being transported in the positive x direction and half a cycle later, when the electric field is in the opposite direction, it will still be transported in the positive x direction. 
C) Energy is being transported in the negative x direction but half a cycle later, when the electric field is in the opposite direction, it will be transported in the positive x direction. 
D) Energy is being transported in the negative x direction and half a cycle later, when the electric field is in the opposite direction, it will still be transported in the negative x direction. 
E) None of the above is true. 
A) Energy is being transported in the positive x direction but half a cycle later, when the electric field is in the opposite direction, it will be transported in the negative x direction. 
B) Energy is being transported in the positive x direction and half a cycle later, when the electric field is in the opposite direction, it will still be transported in the positive x direction. 
C) Energy is being transported in the negative x direction but half a cycle later, when the electric field is in the opposite direction, it will be transported in the positive x direction. 
D) Energy is being transported in the negative x direction and half a cycle later, when the electric field is in the opposite direction, it will still be transported in the negative x direction. 
E) None of the above is true.

Question 19

The rectangular metal tank shown is filled with an unknown liquid.The observer, whose eye is level with the top of the tank, can just see corner E.The index of refraction of this liquid is:

Accepted Answer

A) 1.75 
B) 1.67 
C) 1.50 
D) 1.33 
E) 1.25 
A) 1.75 
B) 1.67 
C) 1.50 
D) 1.33 
E) 1.25

Question 20

The product µ0ε0 has the same units as:

Accepted Answer

A) (velocity)2 
B) (velocity)1/2 
C) 1/velocity 
D) 1/velocity2 
E) 1/velocity1/2 
A) (velocity)2 
B) (velocity)1/2 
C) 1/velocity 
D) 1/velocity2 
E) 1/velocity1/2

Exam 33: Electromagnetic Waves

If the amplitude of the electric field in a plane electromagnetic wave is 100 V/m then the amplitude of the magnetic field is:

An electromagnetic wave is traveling in the positive x direction with its electric field along the z axis and its magnetic field along the y axis.The fields are related by:

The relation θ\thetaθ incident = θ\thetaθ reflected, which applies as a ray of light strikes an interface between two media, is known as:

Light with an intensity of 1 kW/m2 falls normally on a surface with an area of 1 cm2 and is completely reflected.The force of the radiation on the surface is:

The illustration shows total internal reflection taking place in a piece of glass.The index of refraction of this glass:

An electromagnetic wave is transporting energy in the negative y direction.At one point and one instant the magnetic field is in the positive x direction.The electric field at that point and instant is:

Which of the following is NOT true for electromagnetic waves?

Radio waves of wavelength 300 m have a frequency of:

In a plane electromagnetic wave in vacuum, the ratio E/B of the amplitudes in SI units of the two fields is:

As light goes from one medium to another, it is bent away from the normal.Then:

A vertical automobile radio antenna is sensitive to electric fields that are polarized:

A sinusoidal electromagnetic wave with an electric field amplitude of 100 V/m is incident normally on a surface with an area of 1 cm2 and is completely absorbed.The energy absorbed in 10 s is:

Evidence that electromagnetic waves carry momentum is:

Maxwell's equations predict that the speed of electromagnetic waves in free space is given by:

A ray of light passes obliquely through a plate of glass having parallel faces.The emerging ray:

The magnetic field in a sinusoidal light wave has an amplitude of 3.3 *10-7 T.The intensity of the wave is:

At a certain point and a certain time the electric field of an electromagnetic wave is in the negative z direction and the magnetic field is in the positive y direction.Which of the following statements is true?

The rectangular metal tank shown is filled with an unknown liquid.The observer, whose eye is level with the top of the tank, can just see corner E.The index of refraction of this liquid is:

The product µ0ε0 has the same units as:

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The relation $\theta$ _incident = $\theta$ _reflected, which applies as a ray of light strikes an interface between two media, is known as:

Light with an intensity of 1 kW/m² falls normally on a surface with an area of 1 cm² and is completely reflected.The force of the radiation on the surface is:

The illustration shows total internal reflection taking place in a piece of glass.The index of refraction of this glass: $The illustration shows total internal reflection taking place in a piece of glass.The index of refraction of this glass:$

A sinusoidal electromagnetic wave with an electric field amplitude of 100 V/m is incident normally on a surface with an area of 1 cm² and is completely absorbed.The energy absorbed in 10 s is:

The magnetic field in a sinusoidal light wave has an amplitude of 3.3 *10^-7T.The intensity of the wave is:

The product µ₀ε₀ has the same units as: