Question 1

The rms value of the electric field in an electromagnetic wave is Erms = 600 V/m.The average energy density of this wave is approximately

Accepted Answer

A) 0.796 $\mu$J/m3  
B) 1.59 $\mu$J/m3  
C) 3.18 $\mu$J/m3  
D) 6.78 $\mu$J/m3  
E) 5.21 $\mu$J/m3  
A) 0.796 $\mu$J/m3  
B) 1.59 $\mu$J/m3  
C) 3.18 $\mu$J/m3  
D) 6.78 $\mu$J/m3  
E) 5.21 $\mu$J/m3

Question 2

The rms value of the magnitude of the magnetic field in an electromagnetic wave is Brms = 0.378 T.The average energy density of this wave is approximately

Accepted Answer

A) 114 kJ/m3  
B) 28.4 kJ/m3  
C) 31.8 kJ/m3  
D) 67.8 kJ/m3  
E) 56.9 kJ/m3  
A) 114 kJ/m3  
B) 28.4 kJ/m3  
C) 31.8 kJ/m3  
D) 67.8 kJ/m3  
E) 56.9 kJ/m3

Question 3

What is the frequency of 555-nm light?

Accepted Answer

A) 16.7 kHz 
B) 5.40 $\times$ 1014 Hz 
C) 5.40 $\times$ 1015 Hz 
D) 1.70 $\times$ 107 Hz 
E) 5.40 $\times$ 1017 Hz 
A) 16.7 kHz 
B) 5.40 $\times$ 1014 Hz 
C) 5.40 $\times$ 1015 Hz 
D) 1.70 $\times$ 107 Hz 
E) 5.40 $\times$ 1017 Hz

Question 4

Maxwell's equations

Accepted Answer

A) imply that the electric field due to a point charge varies inversely as the square of the distance from the charge. 
B) describe how electric field lines diverge from a positive charge and converge on a negative charge. 
C) assert that the flux of the magnetic field vector is zero through any closed surface. 
D) describe the experimental observation that magnetic field lines do not diverge from any point space or converge to any point. 
E) All of these are correct. 
A) imply that the electric field due to a point charge varies inversely as the square of the distance from the charge. 
B) describe how electric field lines diverge from a positive charge and converge on a negative charge. 
C) assert that the flux of the magnetic field vector is zero through any closed surface. 
D) describe the experimental observation that magnetic field lines do not diverge from any point space or converge to any point. 
E) All of these are correct.

Question 5

You are using an antenna consisting of a single loop of wire of radius 15.0 cm to detect electromagnetic waves for which Erms = 0.200 V/m.If the wave frequency is 600 Hz,the rms value of the emf induced in the loop is approximately

Accepted Answer

A) 32.1 nV 
B) 84.3 nV 
C) 66.7 nV 
D) 178 nV 
E) 643 nV 
A) 32.1 nV 
B) 84.3 nV 
C) 66.7 nV 
D) 178 nV 
E) 643 nV

Question 6

The Sun radiates about 3.83 $\times$1026 W of power.How large should a perfectly reflecting solar sail be on a space ship of mass 50 kg to provide an acceleration of 10-4 m/s2 at the Earth's orbit? The radius of Earth's orbit is 1.50 $\times$1011 m.

Accepted Answer

A) 550 m2 
B) 625 m2 
C) 1100 m2 
D) 2500 m2 
E) None of these is correct. 
A) 550 m2 
B) 625 m2 
C) 1100 m2 
D) 2500 m2 
E) None of these is correct.

Question 7

The wavelength of a 63.7-MHz electromagnetic wave is approximately

Accepted Answer

A) 1.0 m 
B) 4.7 m 
C) 6.8 m 
D) 7.2 cm 
E) 50 cm 
A) 1.0 m 
B) 4.7 m 
C) 6.8 m 
D) 7.2 cm 
E) 50 cm

Question 8

Of X rays,infrared radiation,and radio waves,which has the longest wavelength and which the shortest?

Accepted Answer

A) X rays have the longest,radio waves the shortest. 
B) X rays have the longest,infrared radiation the shortest. 
C) Radio waves have the longest,X rays the shortest. 
D) Radio waves have the longest,infrared radiation the shortest. 
E) Infrared radiation has the longest,X rays the shortest. 
A) X rays have the longest,radio waves the shortest. 
B) X rays have the longest,infrared radiation the shortest. 
C) Radio waves have the longest,X rays the shortest. 
D) Radio waves have the longest,infrared radiation the shortest. 
E) Infrared radiation has the longest,X rays the shortest.

Question 9

Which of the following statements is false?

Accepted Answer

A) isolated electric charges exist 
B) Electric field lines diverge from positive charges and converge on negative charges. 
C) The flux of the magnetic field vector is zero through any closed surface. 
D) isolated magnetic poles exist 
E) changing electric fields induce changing magnetic fields 
A) isolated electric charges exist 
B) Electric field lines diverge from positive charges and converge on negative charges. 
C) The flux of the magnetic field vector is zero through any closed surface. 
D) isolated magnetic poles exist 
E) changing electric fields induce changing magnetic fields

Question 10

You are using an antenna consisting of a single loop of wire of radius 15.0 cm to detect electromagnetic waves for which Erms = 0.200 V/m.If the wave frequency is 600 kHz,the rms value of the emf induced in the loop is approximately

Accepted Answer

A) 32.1 $\mu$V 
B) 84.3 $\mu$V 
C) 66.7 $\mu$V 
D) 178 $\mu$V 
E) 643 $\mu$V 
A) 32.1 $\mu$V 
B) 84.3 $\mu$V 
C) 66.7 $\mu$V 
D) 178 $\mu$V 
E) 643 $\mu$V

Question 11

A beam of light is propagating in the x direction.The electric-field vector

Accepted Answer

A) can oscillate in any arbitrary direction in space. 
B) must oscillate in the z direction. 
C) must oscillate in the yz plane. 
D) must oscillate in the x direction. 
E) must have a steady component in the x direction. 
A) can oscillate in any arbitrary direction in space. 
B) must oscillate in the z direction. 
C) must oscillate in the yz plane. 
D) must oscillate in the x direction. 
E) must have a steady component in the x direction.

Question 12

Light that has a wavelength of 600 nm has a frequency of

Accepted Answer

A) 5.0 $\times$ 1015 Hz 
B) 5.0 $\times$ 1014 Hz 
C) 5.0 $\times$ 106 Hz 
D) 1.2 $\times$ 105 Hz 
E) 1.2 $\times$ 1014 Hz 
A) 5.0 $\times$ 1015 Hz 
B) 5.0 $\times$ 1014 Hz 
C) 5.0 $\times$ 106 Hz 
D) 1.2 $\times$ 105 Hz 
E) 1.2 $\times$ 1014 Hz

Question 13

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the maximum value of the magnetic field at a distance of 2.0 m from the light bulb?

Accepted Answer

A) 71 nT 
B) 0.35 $\mu$T 
C) 0.14 $\mu$T 
D) 0.20 $\mu$T 
E) 0.10 $\mu$T 
A) 71 nT 
B) 0.35 $\mu$T 
C) 0.14 $\mu$T 
D) 0.20 $\mu$T 
E) 0.10 $\mu$T

Question 14

Which of the following statements about light in a vacuum is incorrect?

Accepted Answer

A) Light always travels with the same speed c regardless of the motion of the source or observer. 
B) light has wavelike properties 
C) light has particlelike properties 
D) Light is an electromagnetic wave with its electric-field vector pointing parallel to the direction of propagation. 
E) light can be plane polarized 
A) Light always travels with the same speed c regardless of the motion of the source or observer. 
B) light has wavelike properties 
C) light has particlelike properties 
D) Light is an electromagnetic wave with its electric-field vector pointing parallel to the direction of propagation. 
E) light can be plane polarized

Question 15

An electromagnetic wave is propagating in the   direction and its electric field is given by   .The corresponding magnetic field wave is (where B0 = E0/c)

Accepted Answer

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

Question 16

The Sun radiates about 3.83 $\times$ 1026 W of power.What is the force resulting from the solar radiation on Earth? The radius of Earth's orbit is 1.50 $\times$ 1011 m and the radius of Earth is 6.37 $\times$ 106 m.Assume that all the radiation is absorbed by Earth.

Accepted Answer

A) 1.8 $\times$ 108 N 
B) 2.9 $\times$ 108 N 
C) 5.8 $\times$ 108 N 
D) 8.8 $\times$ 109 N 
E) None of these is correct. 
A) 1.8 $\times$ 108 N 
B) 2.9 $\times$ 108 N 
C) 5.8 $\times$ 108 N 
D) 8.8 $\times$ 109 N 
E) None of these is correct.

Question 17

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the maximum value of the electric field at a distance of 2.0 m from the light bulb?

Accepted Answer

A) 43 V/m 
B) 0.11 mV/m 
C) 21 V/m 
D) 60 V/m 
E) 30 V/m 
A) 43 V/m 
B) 0.11 mV/m 
C) 21 V/m 
D) 60 V/m 
E) 30 V/m

Exam 30: Maxwells Equations and Electromagnetic Waves

The rms value of the electric field in an electromagnetic wave is Erms = 600 V/m.The average energy density of this wave is approximately

The rms value of the magnitude of the magnetic field in an electromagnetic wave is Brms = 0.378 T.The average energy density of this wave is approximately

What is the frequency of 555-nm light?

Maxwell's equations

You are using an antenna consisting of a single loop of wire of radius 15.0 cm to detect electromagnetic waves for which Erms = 0.200 V/m.If the wave frequency is 600 Hz,the rms value of the emf induced in the loop is approximately

The Sun radiates about 3.83 ×\times× 1026 W of power.How large should a perfectly reflecting solar sail be on a space ship of mass 50 kg to provide an acceleration of 10-4 m/s2 at the Earth's orbit? The radius of Earth's orbit is 1.50 ×\times× 1011 m.

The wavelength of a 63.7-MHz electromagnetic wave is approximately

Of X rays,infrared radiation,and radio waves,which has the longest wavelength and which the shortest?

Which of the following statements is false?

You are using an antenna consisting of a single loop of wire of radius 15.0 cm to detect electromagnetic waves for which Erms = 0.200 V/m.If the wave frequency is 600 kHz,the rms value of the emf induced in the loop is approximately

A beam of light is propagating in the x direction.The electric-field vector

Light that has a wavelength of 600 nm has a frequency of

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the maximum value of the magnetic field at a distance of 2.0 m from the light bulb?

Which of the following statements about light in a vacuum is incorrect?

An electromagnetic wave is propagating in the direction and its electric field is given by .The corresponding magnetic field wave is (where B0 = E0/c)

The Sun radiates about 3.83 ×\times× 1026 W of power.What is the force resulting from the solar radiation on Earth? The radius of Earth's orbit is 1.50 ×\times× 1011 m and the radius of Earth is 6.37 ×\times× 106 m.Assume that all the radiation is absorbed by Earth.

A 60-W light bulb emits spherical electromagnetic waves uniformly in all directions.If 50% of the power input to such a light bulb is emitted as electromagnetic radiation,what is the maximum value of the electric field at a distance of 2.0 m from the light bulb?

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Newtons Laws

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Wave Motion

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

The Electric Field I: Discrete Charge Distributions

The Electric Field Ii: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

The rms value of the electric field in an electromagnetic wave is E_rms = 600 V/m.The average energy density of this wave is approximately

The rms value of the magnitude of the magnetic field in an electromagnetic wave is B_rms = 0.378 T.The average energy density of this wave is approximately

You are using an antenna consisting of a single loop of wire of radius 15.0 cm to detect electromagnetic waves for which E_rms = 0.200 V/m.If the wave frequency is 600 Hz,the rms value of the emf induced in the loop is approximately

The Sun radiates about 3.83 $\times$ 10²⁶ W of power.How large should a perfectly reflecting solar sail be on a space ship of mass 50 kg to provide an acceleration of 10^-4 m/s² at the Earth's orbit? The radius of Earth's orbit is 1.50 $\times$ 10¹¹ m.

You are using an antenna consisting of a single loop of wire of radius 15.0 cm to detect electromagnetic waves for which E_rms = 0.200 V/m.If the wave frequency is 600 kHz,the rms value of the emf induced in the loop is approximately

An electromagnetic wave is propagating in the direction and its electric field is given by .The corresponding magnetic field wave is (where B₀ = E₀/c)

The Sun radiates about 3.83 $\times$ 10²⁶ W of power.What is the force resulting from the solar radiation on Earth? The radius of Earth's orbit is 1.50 $\times$ 10¹¹ m and the radius of Earth is 6.37 $\times$ 10⁶ m.Assume that all the radiation is absorbed by Earth.