Question 1

Determine the amount of energy carried in 50 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 × 10−6 m2.

Accepted Answer

A)  2.9 × 10-8 J 
B)  5.8 × 10-10 J 
C)  0.024 J 
D)  2.9 × 10-10 J 
A)  2.9 × 10-8 J 
B)  5.8 × 10-10 J 
C)  0.024 J 
D)  2.9 × 10-10 J B

Question 2

Light not only has wavelike properties,but also has particle-like properties.What are these "particles" of light called?

Accepted Answer

A)  quarks 
B)  wavicles 
C)  photons 
D)  etherons 
A)  quarks 
B)  wavicles 
C)  photons 
D)  etherons C

Question 3

A radar pulse returns 2.0 × 10−4 seconds after it is sent out,having been reflected by an object.What is the distance between the radar antenna and the object? (c = 3.00 × 108 m/s)

Accepted Answer

A)  3.0 × 104 m 
B)  4.5 × 104 m 
C)  9.0 × 104 m 
D)  6.0 × 104 m 
A)  3.0 × 104 m 
B)  4.5 × 104 m 
C)  9.0 × 104 m 
D)  6.0 × 104 m A

Question 4

If the formula for the energy of a photon is E = hc​/λ,where h is a constant,c is the speed of light,and λ is the wavelength of the photon,which of the following is the formula for the momentum of a photon?

Accepted Answer

A)  p = h/λp 
B)  p = hc2/λp 
C)  p = (h2c2/λ2) 
D)  p = h/λcp 
A)  p = h/λp 
B)  p = hc2/λp 
C)  p = (h2c2/λ2) 
D)  p = h/λcp

Question 5

Unpolarized light is passed through polarizer 1.The light then goes though polarizer 2 with its plane of polarization at 30.0° to that of polarizer 1.Polarizer 3 is placed after polarizer 2.Polarizer 3 has its plane of polarization at 30.0° to the plane of polarization of polarizer 2 and at 60.0° to that of polarizer 1.What fraction of the intensity of the original light gets though the last polarizer?

Accepted Answer

A)  0.707 
B)  0.125 
C)  0.281 
D)  0.553 
A)  0.707 
B)  0.125 
C)  0.281 
D)  0.553

Question 6

In order of decreasing frequency,which of the following is correct?

Accepted Answer

A)  infrared,visible,ultraviolet,and gamma 
B)  gamma,ultraviolet,visible,and infrared 
C)  visible,radio,ultraviolet,and X-ray 
D)  visible,gamma,ultraviolet,and X-ray 
A)  infrared,visible,ultraviolet,and gamma 
B)  gamma,ultraviolet,visible,and infrared 
C)  visible,radio,ultraviolet,and X-ray 
D)  visible,gamma,ultraviolet,and X-ray

Question 7

Star #1 is approaching the Earth with speed v.Star #2 is receding from the Earth with the same speed v.Measurements of the same spectral line from each of the stars show Doppler shifts in frequency.The light from which star will have the larger magnitude shift in frequency?

Accepted Answer

A)  star #1 
B)  Both stars will have the same shift. 
C)  The value of the speed must be known before an answer can be found. 
D)  star #2 
A)  star #1 
B)  Both stars will have the same shift. 
C)  The value of the speed must be known before an answer can be found. 
D)  star #2

Question 8

The human eye is sensitive to light with wavelength up to 750 nm.What is the frequency of radiation at this wavelength? (1 nm = 10−9 m and c = 3.00 × 108 m/s)

Accepted Answer

A)  8.5 × 108 Hz 
B)  1.8 × 108 Hz 
C)  4.0 × 1014 Hz 
D)  7.7 × 1014 Hz 
A)  8.5 × 108 Hz 
B)  1.8 × 108 Hz 
C)  4.0 × 1014 Hz 
D)  7.7 × 1014 Hz

Question 9

What is the wavelength of 200 MHz television EM waves? (c = 3 × 108 m/s)

Accepted Answer

A)  9 km 
B)  10 m 
C)  1.5 m 
D)  3 m 
A)  9 km 
B)  10 m 
C)  1.5 m 
D)  3 m

Question 10

The electric field,  
,in an electromagnetic wave is oriented in what direction with respect to its associated magnetic field,  
?

Accepted Answer

A) 
  anti-parallel to
  
B) 
  perpendicular to
  
C) 
  at a 45° angle to
  
D) 
  parallel to
  
A) 
  anti-parallel to
  
B) 
  perpendicular to
  
C) 
  at a 45° angle to
  
D) 
  parallel to

Question 11

An observer is moving in space toward a distant star at 200 km/s while the star is moving toward the observer at 400 km/s;the relative velocity being 600 km/s of approach.What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 105 km/s).

Accepted Answer

A)  0.067% increase 
B)  0.20% decrease 
C)  0.20% increase 
D)  0.033% decrease 
A)  0.067% increase 
B)  0.20% decrease 
C)  0.20% increase 
D)  0.033% decrease

Question 12

An electromagnetic wave with a peak electric field component of 7.5 × 102 N/C has what associated peak magnetic field value? (ε0 = 8.85 × 10−12 C2/N⋅m2,μ0 = 4π × 10−7 T⋅m/A,and c = 3.00 × 108 m/s)

Accepted Answer

A)  2.8 × 10−11 T 
B)  2.5 × 10-6 T 
C)  3.6 × 1010 T 
D)  4.0 × 10−7 T 
A)  2.8 × 10−11 T 
B)  2.5 × 10-6 T 
C)  3.6 × 1010 T 
D)  4.0 × 10−7 T

Question 13

The intensity of light from the Sun is 1.3 kW/m2 at the distance of the Earth.The Earth's radius is 6.4 × 106 m.If all the sunlight that hits the Earth were absorbed,what would be the magnitude of the resulting force on the Earth?

Accepted Answer

A)  0.0087 N 
B)  1.8 × 108 N 
C)  5.6 × 108 N 
D)  87 N 
A)  0.0087 N 
B)  1.8 × 108 N 
C)  5.6 × 108 N 
D)  87 N

Question 14

An electromagnetic wave with a peak magnetic field component of 3.2 × 10−7 T carries what average power per unit area? (μ0 = 4π × 10−7 T⋅m/A,ε0 = 8.85 × 10−12 C2/N⋅m2,and c = 3.00 × 108 m/s)

Accepted Answer

A)  12 W/m2 
B)  3.0 W/m2 
C)  2.7 W/m2 
D)  1.3 W/m2 
A)  12 W/m2 
B)  3.0 W/m2 
C)  2.7 W/m2 
D)  1.3 W/m2

Question 15

An electromagnetic wave with a peak magnetic field component of 7.3 × 10−7 T has an associated peak electric field component of what value? (μ0 = 4π × 10−7 T⋅m/A,ε0 = 8.85 × 10−12 C2/N⋅m2,and c = 3.00 × 108 m/s)

Accepted Answer

A)  45 N/C 
B)  2.0 × 10−5 N/C 
C)  2.2 × 102 N/C 
D)  0.50 × 10−15 N/C 
A)  45 N/C 
B)  2.0 × 10−5 N/C 
C)  2.2 × 102 N/C 
D)  0.50 × 10−15 N/C

Question 16

Why are sound waves not polarizable?

Accepted Answer

A)  Because they are not electromagnetic. 
B)  They are not transverse. 
C)  They are not longitudinal. 
D)  But this is readily possible! 
A)  Because they are not electromagnetic. 
B)  They are not transverse. 
C)  They are not longitudinal. 
D)  But this is readily possible!

Question 17

An ultraviolet light wave has a wavelength of 300 nm and speed of 1.8 × 108 m/s through a transparent medium.What is the frequency of this wave in the medium? (1 nm = 10−9 m and c = 3.00 × 108 m/s)

Accepted Answer

A)  7.0 × 1014 Hz 
B)  6.0 × 1014 Hz 
C)  6.3 × 102 Hz 
D)  10 × 1014 Hz 
A)  7.0 × 1014 Hz 
B)  6.0 × 1014 Hz 
C)  6.3 × 102 Hz 
D)  10 × 1014 Hz

Question 18

What is the maximum value of the electric field E at 0.50 m from a 100 W light bulb radiating in all directions? (µ0 = 4π × 10−7 T⋅m/A,c = 3.00 × 108 m/s)

Accepted Answer

A)  3000 V/m 
B)  155 V/m 
C)  6000 V/m 
D)  77 V/m 
A)  3000 V/m 
B)  155 V/m 
C)  6000 V/m 
D)  77 V/m

Question 19

A 6.0-J pulse of light from a laser has what momentum?

Accepted Answer

A)  Light does not have momentum because it doesn't have mass. 
B)  3.0 × 109 kg·m/s 
C)  6.7 × 10-9 kg·m/s 
D)  2.0 × 10-8 kg·m/s 
A)  Light does not have momentum because it doesn't have mass. 
B)  3.0 × 109 kg·m/s 
C)  6.7 × 10-9 kg·m/s 
D)  2.0 × 10-8 kg·m/s

Question 20

What value of inductance should be used in a series circuit with a capacitor of 9.0 × 10−4 μF when designed to radiate a wavelength of 70 m? (c = 3.00 × 108 m/s)

Accepted Answer

A)  3.8 × 10−4 mH 
B)  1.9 × 10−4 mH 
C)  3.8 mH 
D)  1.5 × 10−3 mH 
A)  3.8 × 10−4 mH 
B)  1.9 × 10−4 mH 
C)  3.8 mH 
D)  1.5 × 10−3 mH

Exam 23: Mirrors and Lenses: Part A

Determine the amount of energy carried in 50 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 × 10−6 m2.

Light not only has wavelike properties,but also has particle-like properties.What are these "particles" of light called?

A radar pulse returns 2.0 × 10−4 seconds after it is sent out,having been reflected by an object.What is the distance between the radar antenna and the object? (c = 3.00 × 108 m/s)

If the formula for the energy of a photon is E = hc​/λ,where h is a constant,c is the speed of light,and λ is the wavelength of the photon,which of the following is the formula for the momentum of a photon?

In order of decreasing frequency,which of the following is correct?

Star #1 is approaching the Earth with speed v.Star #2 is receding from the Earth with the same speed v.Measurements of the same spectral line from each of the stars show Doppler shifts in frequency.The light from which star will have the larger magnitude shift in frequency?

The human eye is sensitive to light with wavelength up to 750 nm.What is the frequency of radiation at this wavelength? (1 nm = 10−9 m and c = 3.00 × 108 m/s)

What is the wavelength of 200 MHz television EM waves? (c = 3 × 108 m/s)

The electric field, ,in an electromagnetic wave is oriented in what direction with respect to its associated magnetic field, ?

An electromagnetic wave with a peak electric field component of 7.5 × 102 N/C has what associated peak magnetic field value? (ε0 = 8.85 × 10−12 C2/N⋅m2,μ0 = 4π × 10−7 T⋅m/A,and c = 3.00 × 108 m/s)

The intensity of light from the Sun is 1.3 kW/m2 at the distance of the Earth.The Earth's radius is 6.4 × 106 m.If all the sunlight that hits the Earth were absorbed,what would be the magnitude of the resulting force on the Earth?

An electromagnetic wave with a peak magnetic field component of 3.2 × 10−7 T carries what average power per unit area? (μ0 = 4π × 10−7 T⋅m/A,ε0 = 8.85 × 10−12 C2/N⋅m2,and c = 3.00 × 108 m/s)

An electromagnetic wave with a peak magnetic field component of 7.3 × 10−7 T has an associated peak electric field component of what value? (μ0 = 4π × 10−7 T⋅m/A,ε0 = 8.85 × 10−12 C2/N⋅m2,and c = 3.00 × 108 m/s)

Why are sound waves not polarizable?

An ultraviolet light wave has a wavelength of 300 nm and speed of 1.8 × 108 m/s through a transparent medium.What is the frequency of this wave in the medium? (1 nm = 10−9 m and c = 3.00 × 108 m/s)

What is the maximum value of the electric field E at 0.50 m from a 100 W light bulb radiating in all directions? (µ0 = 4π × 10−7 T⋅m/A,c = 3.00 × 108 m/s)

A 6.0-J pulse of light from a laser has what momentum?

What value of inductance should be used in a series circuit with a capacitor of 9.0 × 10−4 μF when designed to radiate a wavelength of 70 m? (c = 3.00 × 108 m/s)

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

Filters

Determine the amount of energy carried in 50 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 × 10−⁶ m².

A radar pulse returns 2.0 × 10−⁴ seconds after it is sent out,having been reflected by an object.What is the distance between the radar antenna and the object? (c = 3.00 × 10⁸ m/s)

If the formula for the energy of a photon is E = hc/λ,where h is a constant,c is the speed of light,and λ is the wavelength of the photon,which of the following is the formula for the momentum of a photon?

The human eye is sensitive to light with wavelength up to 750 nm.What is the frequency of radiation at this wavelength? (1 nm = 10−⁹ m and c = 3.00 × 10⁸ m/s)

What is the wavelength of 200 MHz television EM waves? (c = 3 × 10⁸ m/s)

An electromagnetic wave with a peak electric field component of 7.5 × 10² N/C has what associated peak magnetic field value? (ε₀ = 8.85 × 10−¹² C²/N⋅m²,μ₀ = 4π × 10−⁷ T⋅m/A,and c = 3.00 × 10⁸ m/s)

The intensity of light from the Sun is 1.3 kW/m² at the distance of the Earth.The Earth's radius is 6.4 × 10⁶ m.If all the sunlight that hits the Earth were absorbed,what would be the magnitude of the resulting force on the Earth?

An electromagnetic wave with a peak magnetic field component of 3.2 × 10−⁷ T carries what average power per unit area? (μ₀ = 4π × 10−⁷ T⋅m/A,ε₀ = 8.85 × 10−¹² C²/N⋅m²,and c = 3.00 × 10⁸ m/s)

An electromagnetic wave with a peak magnetic field component of 7.3 × 10−⁷ T has an associated peak electric field component of what value? (μ₀ = 4π × 10−⁷ T⋅m/A,ε₀ = 8.85 × 10−¹² C²/N⋅m²,and c = 3.00 × 10⁸ m/s)

An ultraviolet light wave has a wavelength of 300 nm and speed of 1.8 × 10⁸ m/s through a transparent medium.What is the frequency of this wave in the medium? (1 nm = 10−⁹ m and c = 3.00 × 10⁸ m/s)

What is the maximum value of the electric field E at 0.50 m from a 100 W light bulb radiating in all directions? (µ₀ = 4π × 10−⁷ T⋅m/A,c = 3.00 × 10⁸ m/s)

What value of inductance should be used in a series circuit with a capacitor of 9.0 × 10−⁴ μF when designed to radiate a wavelength of 70 m? (c = 3.00 × 10⁸ m/s)