Question 1

For a certain electromagnetic wave in a vacuum,at one instant the  E⃗\vec { E }E  field vector points in the +z direction while the  B⃗\vec { B }B  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)  +z F) B) and E)
G) A) and D)

Question 2

The frequency of a microwave signal is 9.76 GHz.What is its wavelength? (c = 3.00 × 108 m/s)

Accepted Answer

A)  3.07 cm
B)  2.07 cm
C)  1.07 cm
D)  5.07 cm
E)  4.07 cmF) B) and D)
G) A) and B)

Question 3

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.00 × 108 m/s)

Accepted Answer

A)  162 N/C
B)  212 N/C
C)  82.1 N/C
D)  150 N/C
E)  52.9 N/CF) B) and E)
G) C) and D)

Question 4

Unpolarized light of intensity I0 passed through an ideal polarizing sheet with its polarizing axis at the 12 o'clock position and then through a second ideal sheet with its polarizing axis at the 1 o'clock position.What is the intensity of the emerging light in terms of I0?

Accepted Answer

Question 5

Which one of the following lists gives the correct order of the electromagnetic spectrum from low to high frequencies?

Accepted Answer

A)  radio waves, infrared, microwaves, ultraviolet, visible, x-rays, gamma rays
B)  radio waves, ultraviolet, x-rays, microwaves, infrared, visible, gamma rays
C)  radio waves, microwaves, infrared, visible, ultraviolet, x-rays, gamma rays
D)  radio waves, microwaves, visible, x-rays, infrared, ultraviolet, gamma rays
E)  radio waves, infrared, x-rays, microwaves, ultraviolet, visible, gamma raysF) C) and D)
G) A) and D)

Question 6

A radar receiver indicates that a pulse return as an echo in 20 μs after it was sent.How far away is the reflecting object? (c = 3.0 × 108 m/s)

Accepted Answer

A)  1.5 km
B)  3.0 km
C)  6.0 km
D)  9.0 kmE) B) and C)
F) All of the above

Question 7

For a beam of light,the direction of polarization is defined as

Accepted Answer

A)  the beam's direction of travel.
B)  the direction of the  E⃗\vec { E }E3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field's vibration.
C)  the direction of the  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field's vibration.
D)  the direction that is perpendicular to both the  E⃗\vec { E }E3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field and  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field vectors. E) All of the above
F) B) and D)

Question 8

A 7.55 ×  101410^{14}1014  Hz electromagnetic wave travels in carbon tetrachloride with a speed of 2.05 ×108 m/s.What is the wavelength of the wave in this material?

Accepted Answer

A)  272 nm
B)  301 nm
C)  338 nm
D)  361 nm
E)  397 nm F) C) and E)
G) C) and D)

Question 9

Unpolarized light passes through three ideal polarizing filters.The first filter is oriented with a horizontal transmission axis,the second one has its transmission axis at 30° from the horizontal,and the third filter has a vertical transmission axis.What percent of the light gets through this combination?

Accepted Answer

A)  9.4%
B)  91%
C)  50%
D)  0%
E)  33%F) A) and B)
G) B) and E)

Question 10

Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)

Accepted Answer

A)  The higher-frequency travel faster than the lower-frequency waves.
B)  The higher-frequency waves have shorter wavelengths than the lower-frequency waves.
C)  The wavelengths of the visible waves are some of the longest electromagnetic waves.
D)  The wavelengths of the visible waves are some of the shortest electromagnetic waves.
E)  The  E⃗\vec { E }E3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field vector is always at right angles to the  B⃗\vec { B }B3.333 2.667 6.667 9 10 19 6.667 24.667 20.333 43.667 41 57 7.333 4.667 1110.667 11 18 0 6-1 10-3 12s-6.667 5-14 9c-28.667 14.667-53.667 35.667-75 63-1.333 1.333-3.167 3.5-5.5 6.5s-4 4.833-5 5.5c-1 .667-2.5 1.333-4.5 2s-4.333 1-7 1c-4.667 0-9.167-1.833-13.5-5.5S337 184 337 178c0-12.667 15.667-32.333 47-59H213l-171-1c-8.667-6-13-12.333-13-19 0-4.667 4.333-11.333 13-20h359c-16-25.333-24-45-24-59z'/>  field vector. F) A) and E)
G) B) and D)

Question 11

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb?

Accepted Answer

A)  14.9 W/m2
B)  37.2 W/m2
C)  27.4 W/m2
D)  11.9 W/m2
E)  29.8 W/m2F) A) and C)
G) B) and C)

Question 12

Find Brewster's angle for light in air that is reflected from the top of a water surface.The index of refraction of the water is 1.33.

Accepted Answer

A)  53.1°
B)  36.9°
C)  56.3°
D)  60.2°
E)  90.0°F) A) and B)
G) C) and D)

Question 13

What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? (c = 3.00 × 108 m/s)

Accepted Answer

A)  22.6 m
B)  226 m
C)  326 m
D)  175 m
E)  276 mF) A) and E)
G) A) and D)

Question 14

The energy density of an electromagnetic wave in free space is

Accepted Answer

A)  entirely in the electric field.
B)  entirely in the magnetic field.
C)  1/4 in the electric field and 3/4 in the magnetic field.
D)  1/4 in the magnetic field and 3/4 in the electric field.
E)  equally divided between the magnetic and the electric fields.F) C) and D)
G) B) and D)

Question 15

Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m2.What is the maximum value of the  E⃗\vec { E }E  field associated with this radiation? (c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Accepted Answer

A)  675.0 V/m
B)  1604 V/m
C)  1400 V/m
D)  1350 V/m
E)  1010 V/m F) A) and E)
G) A) and B)

Question 16

A radio station broadcasts at a frequency of 80 MHz.How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 108 m/s)

Accepted Answer

A)  60 × 106 m
B)  67 m
C)  40 km
D)  80 km
E)  20 × 106 mF) B) and E)
G) B) and C)

Question 17

Which one of the following types of electromagnetic wave travels through space the fastest?

Accepted Answer

A)  radio waves
B)  infrared
C)  ultraviolet
D)  microwaves
E)  They all travel through space at the same speed.F) B) and E)
G) None of the above

Question 18

How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)

Accepted Answer

A)  6.0 × 105 m
B)  0.66 × 105 m
C)  90 m
D)  70 m
E)  60 mF) B) and E)
G) B) and C)

Question 19

The critical angle for an air-glass interface is 42.6°.A light ray in air hits the interface,and the reflected ray is 100% polarized.What is the angle of refraction for that ray?

Accepted Answer

A)  47.4°
B)  55.9°
C)  24.3°
D)  65.7°
E)  34.1°F) B) and D)
G) None of the above

Exam 25: Electromagnetic Waves

Which one of the following types of electromagnetic wave travels through space the fastest?

Correct Answer
verified

A 7.55 × $10^{14}$ Hz electromagnetic wave travels in carbon tetrachloride with a speed of 2.05 ×10⁸ m/s.What is the wavelength of the wave in this material?

Correct Answer
verified

The critical angle for an air-glass interface is 42.6°.A light ray in air hits the interface,and the reflected ray is 100% polarized.What is the angle of refraction for that ray?

Correct Answer
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What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? (c = 3.00 × 10⁸ m/s)

Correct Answer
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Correct Answer
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A radar receiver indicates that a pulse return as an echo in 20 μs after it was sent.How far away is the reflecting object? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
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A radio station broadcasts at a frequency of 80 MHz.How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 10⁸ m/s)

Correct Answer
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Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m².What is the maximum value of the $\vec { E }$ field associated with this radiation? (c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Correct Answer
verified

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb?

Correct Answer
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A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.00 × 10⁸ m/s)

Correct Answer
verified

The frequency of a microwave signal is 9.76 GHz.What is its wavelength? (c = 3.00 × 10⁸ m/s)

Correct Answer
verified

Which one of the following lists gives the correct order of the electromagnetic spectrum from low to high frequencies?

Correct Answer
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Unpolarized light of intensity I₀ passed through an ideal polarizing sheet with its polarizing axis at the 12 o'clock position and then through a second ideal sheet with its polarizing axis at the 1 o'clock position.What is the intensity of the emerging light in terms of I₀?

Correct Answer
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Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)

Correct Answer
verified

How far does a beam of light travel in 2.0 ms? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

For a beam of light,the direction of polarization is defined as

Correct Answer
verified

The energy density of an electromagnetic wave in free space is

Correct Answer
verified

Find Brewster's angle for light in air that is reflected from the top of a water surface.The index of refraction of the water is 1.33.

Correct Answer
verified

Exam 25: Electromagnetic Waves

Which one of the following types of electromagnetic wave travels through space the fastest?

Correct AnswerverifiedShow Answer

A 7.55 × 101410^{14}1014 Hz electromagnetic wave travels in carbon tetrachloride with a speed of 2.05 ×108 m/s.What is the wavelength of the wave in this material?

Correct AnswerverifiedShow Answer

The critical angle for an air-glass interface is 42.6°.A light ray in air hits the interface,and the reflected ray is 100% polarized.What is the angle of refraction for that ray?

Correct AnswerverifiedShow Answer

What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? (c = 3.00 × 108 m/s)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A radar receiver indicates that a pulse return as an echo in 20 μs after it was sent.How far away is the reflecting object? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

For a certain electromagnetic wave in a vacuum,at one instant the E⃗\vec { E }E field vector points in the +z direction while the B⃗\vec { B }B field vector points in the +x direction,as shown in the figure.In what direction is this wave traveling?

Correct AnswerverifiedShow Answer

A radio station broadcasts at a frequency of 80 MHz.How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m2.What is the maximum value of the E⃗\vec { E }E field associated with this radiation? (c = 3.00 × 108 m/s,μ0 = 4π × 10-7 T ∙ m/A,ε0 = 8.85 × 10-12 C2/N ∙ m2)

Correct AnswerverifiedShow Answer

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the average intensity of the light from this bulb at a distance of 0.400 m from the bulb?

Correct AnswerverifiedShow Answer

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.00 × 108 m/s)

Correct AnswerverifiedShow Answer

The frequency of a microwave signal is 9.76 GHz.What is its wavelength? (c = 3.00 × 108 m/s)

Correct AnswerverifiedShow Answer

Which one of the following lists gives the correct order of the electromagnetic spectrum from low to high frequencies?

Correct AnswerverifiedShow Answer

Unpolarized light of intensity I0 passed through an ideal polarizing sheet with its polarizing axis at the 12 o'clock position and then through a second ideal sheet with its polarizing axis at the 1 o'clock position.What is the intensity of the emerging light in terms of I0?

Correct AnswerverifiedShow Answer

Which of the following statements about electromagnetic waves in a vacuum are true? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

How far does a beam of light travel in 2.0 ms? (c = 3.0 × 108 m/s)

Correct AnswerverifiedShow Answer

For a beam of light,the direction of polarization is defined as

Correct AnswerverifiedShow Answer

The energy density of an electromagnetic wave in free space is

Correct AnswerverifiedShow Answer

Find Brewster's angle for light in air that is reflected from the top of a water surface.The index of refraction of the water is 1.33.

Correct AnswerverifiedShow Answer

Correct Answer
verified

A 7.55 × $10^{14}$ Hz electromagnetic wave travels in carbon tetrachloride with a speed of 2.05 ×10⁸ m/s.What is the wavelength of the wave in this material?

Correct Answer
verified

Correct Answer
verified

What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? (c = 3.00 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

A radar receiver indicates that a pulse return as an echo in 20 μs after it was sent.How far away is the reflecting object? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
verified

A radio station broadcasts at a frequency of 80 MHz.How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 10⁸ m/s)

Correct Answer
verified

Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m².What is the maximum value of the $\vec { E }$ field associated with this radiation? (c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

Correct Answer
verified

Correct Answer
verified

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.00 × 10⁸ m/s)

Correct Answer
verified

The frequency of a microwave signal is 9.76 GHz.What is its wavelength? (c = 3.00 × 10⁸ m/s)

Correct Answer
verified

Correct Answer
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Unpolarized light of intensity I₀ passed through an ideal polarizing sheet with its polarizing axis at the 12 o'clock position and then through a second ideal sheet with its polarizing axis at the 1 o'clock position.What is the intensity of the emerging light in terms of I₀?

Correct Answer
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Correct Answer
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How far does a beam of light travel in 2.0 ms? (c = 3.0 × 10⁸ m/s)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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