Question 1

Which diagram below illustrates the path of a light ray as it travels from a given point X in air to another given point Y in glass?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 2

When the distance between a point source of light and a light meter is reduced from 6.0 m to 2.0 m, the intensity of illumination at the meter will be the original value multiplied by:

Accepted Answer

A)  3 
B)  9 
C)  1/3 
D)  1/9 
E)  1 
A)  3 
B)  9 
C)  1/3 
D)  1/9 
E)  1

Question 3

For linearly polarized light the plane of polarization is:

Accepted Answer

A)  perpendicular to both the direction of polarization and the direction of propagation 
B)  perpendicular to the direction of polarization and parallel to the direction of propagation 
C)  parallel to the direction of polarization and perpendicular to the direction of propagation 
D)  parallel to both the direction of polarization and the direction of propagation 
E)  none of the above 
A)  perpendicular to both the direction of polarization and the direction of propagation 
B)  perpendicular to the direction of polarization and parallel to the direction of propagation 
C)  parallel to the direction of polarization and perpendicular to the direction of propagation 
D)  parallel to both the direction of polarization and the direction of propagation 
E)  none of the above

Question 4

Maxwell's equations predict that the speed of light in free space is:

Accepted Answer

A)  an increasing function of frequency 
B)  a decreasing function of frequency 
C)  independent of frequency 
D)  a function of the distance from the source 
E)  a function of the size of the source 
A)  an increasing function of frequency 
B)  a decreasing function of frequency 
C)  independent of frequency 
D)  a function of the distance from the source 
E)  a function of the size of the source

Question 5

The electric field in unpolarized light:

Accepted Answer

A)  has no direction at any time 
B)  rotates rapidly 
C)  is always parallel to the direction of propagation 
D)  can be in any direction perpendicular to the direction of propagation 
E)  remains along the same line but reverses direction randomly and often 
A)  has no direction at any time 
B)  rotates rapidly 
C)  is always parallel to the direction of propagation 
D)  can be in any direction perpendicular to the direction of propagation 
E)  remains along the same line but reverses direction randomly and often

Question 6

A company claims to have developed material that absorbs light energy without a transfer of momentum. Such material is:

Accepted Answer

A)  impossible 
B)  possible, but very expensive 
C)  inexpensive and already in common use 
D)  in use by NASA but is not commercially available 
E)  a breakthrough in high technology 
A)  impossible 
B)  possible, but very expensive 
C)  inexpensive and already in common use 
D)  in use by NASA but is not commercially available 
E)  a breakthrough in high technology

Question 7

Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?

Accepted Answer

A)  Radio waves 
B)  Visible light 
C)  X rays 
D)  Gamma rays 
E)  All of these travel at the same speed 
A)  Radio waves 
B)  Visible light 
C)  X rays 
D)  Gamma rays 
E)  All of these travel at the same speed

Question 8

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 9

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 10

In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at 45  $\degree$ to the axes of the other two. The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack is:

Accepted Answer

A)  1/2 
B)  1/3 
C)  1/4 
D)  1/8 
E)  0 
A)  1/2 
B)  1/3 
C)  1/4 
D)  1/8 
E)  0

Question 11

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 12

A ray of light in water (index n1) is incident on its surface (with air) at the critical angle. Some oil (index n2) is now floated on the water. The angle between the ray in the oil and the normal is:

Accepted Answer

A)  sin-1(1.00) 
B)  sin-1(1/n1) 
C)  sin-1(1/n2) 
D)  sin-1(n1/n2) 
E)  sin-1(n2/n1) 
A)  sin-1(1.00) 
B)  sin-1(1/n1) 
C)  sin-1(1/n2) 
D)  sin-1(n1/n2) 
E)  sin-1(n2/n1)

Question 13

The index of refraction of benzene is 1.80. The critical angle for total internal reflection, at a benzene-air interface, is about:

Accepted Answer

A)  56  $\degree$ 
B)  47  $\degree$ 
C)  34  $\degree$ 
D)  22  $\degree$ 
E)  18  $\degree$ 
A)  56  $\degree$ 
B)  47  $\degree$ 
C)  34  $\degree$ 
D)  22  $\degree$ 
E)  18  $\degree$

Question 14

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 15

Consider radio waves (r), visible light (v), infrared (i), X rays (x), and ultraviolet (u). In order of increasing frequency, they are:

Accepted Answer

A)  r, v, i, x, u 
B)  r, i, v, u, x 
C)  i, r, v, u, x 
D)  x, u, v, i, r 
E)  r, i, v, x, u 
A)  r, v, i, x, u 
B)  r, i, v, u, x 
C)  i, r, v, u, x 
D)  x, u, v, i, r 
E)  r, i, v, x, u

Question 16

When light passes from air to glass, it bends:

Accepted Answer

A)  toward the normal without changing speed 
B)  toward the normal and slows down 
C)  toward the normal and speeds up 
D)  away from the normal and slows down 
E)  away from the normal and speeds up 
A)  toward the normal without changing speed 
B)  toward the normal and slows down 
C)  toward the normal and speeds up 
D)  away from the normal and slows down 
E)  away from the normal and speeds up

Question 17

The speed of light in vacuum is about:

Accepted Answer

A)  1100 ft/s 
B)  93 *106 mi/s 
C)  6*1023 m/s 
D)  3 *1010 cm/s 
E)  186,000 mph 
A)  1100 ft/s 
B)  93 *106 mi/s 
C)  6*1023 m/s 
D)  3 *1010 cm/s 
E)  186,000 mph

Question 18

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 19

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 20

The separation of white light into colors by a prism is associated with:

Accepted Answer

A)  total internal reflection 
B)  partial reflection from each surface 
C)  variation of index of refraction with wavelength 
D)  a decrease in the speed of light in the glass 
E)  selective absorption of various colors 
A)  total internal reflection 
B)  partial reflection from each surface 
C)  variation of index of refraction with wavelength 
D)  a decrease in the speed of light in the glass 
E)  selective absorption of various colors

Exam 33: Electromagnetic Waves

Which diagram below illustrates the path of a light ray as it travels from a given point X in air to another given point Y in glass?

When the distance between a point source of light and a light meter is reduced from 6.0 m to 2.0 m, the intensity of illumination at the meter will be the original value multiplied by:

For linearly polarized light the plane of polarization is:

Maxwell's equations predict that the speed of light in free space is:

The electric field in unpolarized light:

A company claims to have developed material that absorbs light energy without a transfer of momentum. Such material is:

Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum?

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

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

In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at 45 °\degree° to the axes of the other two. The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack is:

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

A ray of light in water (index n1) is incident on its surface (with air) at the critical angle. Some oil (index n2) is now floated on the water. The angle between the ray in the oil and the normal is:

The index of refraction of benzene is 1.80. The critical angle for total internal reflection, at a benzene-air interface, is about:

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

Consider radio waves (r), visible light (v), infrared (i), X rays (x), and ultraviolet (u). In order of increasing frequency, they are:

When light passes from air to glass, it bends:

The speed of light in vacuum is about:

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

The separation of white light into colors by a prism is associated with:

Measurement

Motion Along a Straight Line

Vector

Motion in Two and Three Dimensions

Force and Motion I

Force and Motion II

Kinetic Energy and Work

Potential Energy and Conservation of Energy

Center of Mass and Linear Momentum

Rotation

Rolling, Torque, and Angular Momentum

Equilibrium and Elasticity

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The Kinetic Theory of Gases

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In a stack of three polarizing sheets the first and third are crossed while the middle one has its axis at 45 $\degree$ to the axes of the other two. The fraction of the intensity of an incident unpolarized beam of light that is transmitted by the stack 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 ray of light in water (index n₁) is incident on its surface (with air) at the critical angle. Some oil (index n₂) is now floated on the water. The angle between the ray in the oil and the normal is:

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