Question 1

The relation n1sin θ	hetaθ 1 = n2 sin  θ	hetaθ 2 which applies as a ray of light strikes an interface between two media, is known as:

Accepted Answer

A)   Gauss' law
B)   Snell's law
C)   Faraday's law
D)   Cole's law
E)   law of sines F) All of the above
G) None of the above

Question 2

As used in the laws of reflection and refraction, the "normal" direction is:

Accepted Answer

A)   any convenient direction
B)   tangent to the interface
C)   along the incident ray
D)   perpendicular to the electric field vector of the light
E)   perpendicular to the interfaceF) C) and D)
G) C) and E)

Question 3

If nwater = 1.50 and nglass = 1.33, then total internal reflection at an interface between this glass and water:

Accepted Answer

A)   occurs whenever the light goes from glass to water
B)   occurs whenever the light goes from water to glass
C)   may occur when the light goes from glass to water
D)   may occur when the light goes from water to glass
E)   can never occur at this interfaceF) B) and E)
G) C) and D)

Question 4

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)   1F) A) and B)
G) None of the above

Question 5

The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown?

Accepted Answer

A)   (sin a) /(sin b)  = 2.5
B)   (sin b) /(sin d)  = 2.5
C)   (cos a) /(cos c)  = 2.5
D)   (sin a) /(sin c)  = 1/(2.5) 
E)   a/c = 2.5F) C) and E)
G) A) and D)

Question 6

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 mphF) C) and D)
G) A) and E)

Question 7

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 aboveF) D) and E)
G) A) and D)

Question 8

Three polarizing sheets are placed in a stack with the polarizing directions of the first and third perpendicular to each other. What angle 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 °\degree° 
C)   45 °\degree° 
D)   60 °\degree° 
E)   all angles allow light to pass through F) None of the above
G) A) and D)

Question 9

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 technologyF) A) and B)
G) All of the above

Question 10

The theoretical upper limit for the frequency of electromagnetic waves is:

Accepted Answer

A)   just slightly greater than that of red light
B)   just slightly less than that of blue light
C)   the greatest x-ray frequency
D)   none of the above (there is no upper limit) 
E)   none of the above (but there is an upper limit) F) A) and C)
G) A) and B)

Question 11

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°F) A) and E)
G) C) and D)

Question 12

When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:

Accepted Answer

A)   the material of the reflecting surface
B)   the angle of incidence
C)   the index of the medium
D)   the intensity of the wave
E)   the wavelengthF) A) and C)
G) A) and B)

Question 13

If the magnetic field in a plane electromagnetic wave is along the y axis and its component is given by Bm sin (kx -   ω \omega ω t) , in SI units them the electric field is along the z axis its component is given by"

Accepted Answer

A)   (cBm) cos(kx -   ω \omega ω t) 
B)   -(cBm/c) cos(kx -   ω \omega ω t) 
C)   -(cBm/c) ) sin(kx -   ω \omega ω t) 
D)   Bmcos(kx -   ω \omega ω t) 
E)   (cBm/c) ) sin(kx -   ω \omega ω t)  F) A) and B)
G) B) and C)

Question 14

The diagram shows total internal reflection. Which of the following statements is NOT true?

Accepted Answer

A)   angle AON is the angle of incidence
B)   angle AON = angle BON
C)   angle AON must be the critical angle
D)   the speed of light in medium II is greater than that in medium I
E)   if angle AON were increased, there would still be total internal reflectionF) C) and D)
G) B) and E)

Question 15

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

Accepted Answer

A)   0
B)   30 °\degree° 
C)   45 °\degree° 
D)   60 °\degree° 
E)   90 °\degree°F) A) and C)
G) A) and B)

Question 16

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

Accepted Answer

A)   1 kPa
B)   3 *1011 Pa
C)   1.7*10-6 Pa
D)   3.3 *10-6 Pa
E)   6.7 *10-6 PaF) A) and B)
G) B) and E)

Question 17

The electric field for a plane electromagnetic wave traveling in the +y direction is shown. Consider a point where  is in the +z direction. The  field is:

Accepted Answer

A)   in the +x direction and in phase with the  field
B)   in the -x direction and in phase with the  field
C)   in the +x direction and 1/4 wave out of phase with the  field
D)   in the +z direction and in phase with the  field
E)   in the +z direction and 1/4 wave out of phase with the  fieldF) None of the above
G) B) and C)

Question 18

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 speedF) D) and E)
G) A) and E)

Question 19

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)   F) B) and D)
G) B) and E)

Question 20

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) F) All of the above
G) D) and E)

Exam 33: Electromagnetic Waves

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

Correct Answer
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The relation n₁sin $\theta$ ₁ = n₂ sin $\theta$ ₂ which applies as a ray of light strikes an interface between two media, is known as:

Correct Answer
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The diagram shows total internal reflection. Which of the following statements is NOT true?

Correct Answer
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The electric field for a plane electromagnetic wave traveling in the +y direction is shown. Consider a point where is in the +z direction. The field is:

Correct Answer
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Correct Answer
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As used in the laws of reflection and refraction, the "normal" direction is:

Correct Answer
verified

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

Correct Answer
verified

The speed of light in vacuum is about:

Correct Answer
verified

The theoretical upper limit for the frequency of electromagnetic waves is:

Correct Answer
verified

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:

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

If n_water = 1.50 and n_glass = 1.33, then total internal reflection at an interface between this glass and water:

Correct Answer
verified

If the magnetic field in a plane electromagnetic wave is along the y axis and its component is given by B_m sin (kx - $\omega$ t) , in SI units them the electric field is along the z axis its component is given by"

Correct Answer
verified

When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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:

Correct Answer
verified

Exam 33: Electromagnetic Waves

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

Correct AnswerverifiedShow Answer

The relation n1sin θ\thetaθ 1 = n2 sin θ\thetaθ 2 which applies as a ray of light strikes an interface between two media, is known as:

Correct AnswerverifiedShow Answer

The diagram shows total internal reflection. Which of the following statements is NOT true?

Correct AnswerverifiedShow Answer

The electric field for a plane electromagnetic wave traveling in the +y direction is shown. Consider a point where is in the +z direction. The field is:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

As used in the laws of reflection and refraction, the "normal" direction is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The speed of light in vacuum is about:

Correct AnswerverifiedShow Answer

The theoretical upper limit for the frequency of electromagnetic waves is:

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown?

Correct AnswerverifiedShow Answer

If nwater = 1.50 and nglass = 1.33, then total internal reflection at an interface between this glass and water:

Correct AnswerverifiedShow Answer

If the magnetic field in a plane electromagnetic wave is along the y axis and its component is given by Bm sin (kx - ω \omega ω t) , in SI units them the electric field is along the z axis its component is given by"

Correct AnswerverifiedShow Answer

When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

Correct Answer
verified

The relation n₁sin $\theta$ ₁ = n₂ sin $\theta$ ₂ which applies as a ray of light strikes an interface between two media, is known as:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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:

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

If n_water = 1.50 and n_glass = 1.33, then total internal reflection at an interface between this glass and water:

Correct Answer
verified

If the magnetic field in a plane electromagnetic wave is along the y axis and its component is given by B_m sin (kx - $\omega$ t) , in SI units them the electric field is along the z axis its component is given by"

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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