Question 1

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. E

Question 2

Which of the following groups is arranged in order of increasing wavelength?

Accepted Answer

A)  infrared, ultraviolet, microwaves 
B)  X rays, visible, infrared 
C)  gamma rays, ultraviolet, X rays 
D)  microwaves, gamma rays, visible 
E)  infrared, ultraviolet, gamma rays 
A)  infrared, ultraviolet, microwaves 
B)  X rays, visible, infrared 
C)  gamma rays, ultraviolet, X rays 
D)  microwaves, gamma rays, visible 
E)  infrared, ultraviolet, gamma rays B

Question 3

The frequency range for FM broadcasts is from 87.9 - 107.9 MHz in the U.S. In terms of wavelengths, the range corresponds to

Accepted Answer

A)  87.9 - 107.9 m 
B)  2.78 - 3.41 m 
C)  83.3 - 102.3 m 
D)  12.4 - 19.5 m 
E)  None of these is correct. 
A)  87.9 - 107.9 m 
B)  2.78 - 3.41 m 
C)  83.3 - 102.3 m 
D)  12.4 - 19.5 m 
E)  None of these is correct. B

Question 4

The left part of the figure shows an dipole oscillating in a sinusoidal function. Which of the curves best represents the electric field along the axis of the dipole?

Accepted Answer

A)  1 - sinusoidal wave in the plane of the dipole 
B)  2 - sinusoidal wave perpendicular to the plane of the dipole 
C)  3 - circular wave perpendicular to the plane of the dipole 
D)  4 - circular wave in the plane of the dipole 
E)  None of these is correct. 
A)  1 - sinusoidal wave in the plane of the dipole 
B)  2 - sinusoidal wave perpendicular to the plane of the dipole 
C)  3 - circular wave perpendicular to the plane of the dipole 
D)  4 - circular wave in the plane of the dipole 
E)  None of these is correct.

Question 5

The Sun radiates about 3.83 *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 *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 6

There are many different regions to the electromagnetic spectrum. These include, (a) visible light, (b) gamma-rays, (c) infra-red, (d) micro-waves, (e) radio-waves, (f) ultra-violet, and (g) X-rays. Put them in order of increasing wavelength, starting with the shortest wavelength first.

Accepted Answer

A)  bgdafge 
B)  bgfadce 
C)  bgafcde 
D)  bgfacde 
E)  bgafdce 
A)  bgdafge 
B)  bgfadce 
C)  bgafcde 
D)  bgfacde 
E)  bgafdce

Question 7

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 8

Earth is about 28,000 light years from the center of the Milky Way Galaxy. If a supernova explosion occurred approximately 14,000 light years away from us and released 2.0 * 1046 J of energy in a sudden burst of light, how much energy would enter one of your pupils? Assume the diameter of a pupil to be about 4 mm. (For comparison, our Sun radiates approximately 4 *1026 J/s.)

Accepted Answer

A)  1.1 J 
B)  3.0 * 1023 J 
C)  3.5 J 
D)  4.6 J 
E)  2.2 J 
A)  1.1 J 
B)  3.0 * 1023 J 
C)  3.5 J 
D)  4.6 J 
E)  2.2 J

Question 9

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 10

Light wave A has twice the frequency of light wave B. The wavelength of light wave A is _____ that of light wave B.

Accepted Answer

A)  equal to 
B)  twice 
C)  four times 
D)  half 
E)  one-fourth 
A)  equal to 
B)  twice 
C)  four times 
D)  half 
E)  one-fourth

Question 11

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 12

The left part of the figure shows a dipole oscillating in a sinusoidal function. Which of the curves best represents the magnetic field along the axis of the dipole centered about the dipole?

Accepted Answer

A)  1 - sinusoidal wave in the plane of the dipole 
B)  2 - sinusoidal wave perpendicular to the plane of the dipole 
C)  3 - circular wave perpendicular to the plane of the dipole; the intensity propagates in a sinusoidal function 
D)  4 - circular wave in the plane of the dipole.; the intensity propagates in a sinusoidal function 
E)  None of these is correct. 
A)  1 - sinusoidal wave in the plane of the dipole 
B)  2 - sinusoidal wave perpendicular to the plane of the dipole 
C)  3 - circular wave perpendicular to the plane of the dipole; the intensity propagates in a sinusoidal function 
D)  4 - circular wave in the plane of the dipole.; the intensity propagates in a sinusoidal function 
E)  None of these is correct.

Question 13

What is the frequency of 555-nm light?

Accepted Answer

A)  16.7 kHz 
B)  5.40* 1014 Hz 
C)  5.40 *1015 Hz 
D)  1.70 * 107 Hz 
E)  5.40 * 1017 Hz 
A)  16.7 kHz 
B)  5.40* 1014 Hz 
C)  5.40 *1015 Hz 
D)  1.70 * 107 Hz 
E)  5.40 * 1017 Hz

Question 14

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 radiation intensity at a distance of 2.00 m from the light bulb?

Accepted Answer

A)  15 W/m2  
B)  4.8 W/m2  
C)  2.4 W/m2  
D)  0.60 W/m2  
E)  1.2 W/m2  
A)  15 W/m2  
B)  4.8 W/m2  
C)  2.4 W/m2  
D)  0.60 W/m2  
E)  1.2 W/m2

Question 15

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 16

A common unit of length in astronomy is the parsec, where 1 parsec = 3.26 light years. How many seconds does it take a radio signal to travel one parsec through space?

Accepted Answer

A)  1.03 *108 s 
B)  9.71 *108 s 
C)  9.71 * 107 s 
D)  1.72 * 106 s 
E)  none of the above 
A)  1.03 *108 s 
B)  9.71 *108 s 
C)  9.71 * 107 s 
D)  1.72 * 106 s 
E)  none of the above

Question 17

The rms value of the electric field in an electromagnetic wave is Erms = 200 V/m. The intensity of this wave is approximately

Accepted Answer

A)  53.1 W/m2  
B)  106 W/m2  
C)  1.59*1010 W/m2  
D)  3.18 * 1010 W/m2  
E)  1.70 kW/m2  
A)  53.1 W/m2  
B)  106 W/m2  
C)  1.59*1010 W/m2  
D)  3.18 * 1010 W/m2  
E)  1.70 kW/m2

Question 18

Which of the following statements is true?

Accepted Answer

A)  Maxwell's equations apply only to fields that are constant in time. 
B)  Electromagnetic waves are longitudinal waves. 
C)  The electric and magnetic fields are out of phase in an electromagnetic wave. 
D)  The electric- and magnetic-field vectors   and   are equal in magnitude in an electromagnetic wave. 
E)  None of these statements is true. 
A)  Maxwell's equations apply only to fields that are constant in time. 
B)  Electromagnetic waves are longitudinal waves. 
C)  The electric and magnetic fields are out of phase in an electromagnetic wave. 
D)  The electric- and magnetic-field vectors   and   are equal in magnitude in an electromagnetic wave. 
E)  None of these statements is true.

Question 19

Which of the following functions satisfy the one-dimensional wave equation?

Accepted Answer

A)  y(x, t) = y0 cos(kx - $ \omega $t) 
B)  y(x, t) = y0 sin(kx - $ \omega $t) 
C)  y(x, t) = y0 sin(kx - $ \omega $t) + B cos(kx - $ \omega $t) 
D)  y(x, t) = y0 (sin kx) · B(cos$ \omega $t) 
E)  All of these functions satisfy the one-dimensional wave equation. 
A)  y(x, t) = y0 cos(kx - $ \omega $t) 
B)  y(x, t) = y0 sin(kx - $ \omega $t) 
C)  y(x, t) = y0 sin(kx - $ \omega $t) + B cos(kx - $ \omega $t) 
D)  y(x, t) = y0 (sin kx) · B(cos$ \omega $t) 
E)  All of these functions satisfy the one-dimensional wave equation.

Question 20

A parallel-plate capacitor has closely spaced circular plates of radius R = 3.00 cm. Charge is flowing onto the positive plate at the rate I = dQ/dt = 3.65 A. The magnetic field at a distance r = 1.50 cm from the axis of the plates is approximately

Accepted Answer

A)  135 mT 
B)  256 $\mu$T 
C)  1.35$\mu$T 
D)  457 mT 
E)  88.3 $\mu$T 
A)  135 mT 
B)  256 $\mu$T 
C)  1.35$\mu$T 
D)  457 mT 
E)  88.3 $\mu$T

Maxwell's equations

Which of the following groups is arranged in order of increasing wavelength?

The frequency range for FM broadcasts is from 87.9 - 107.9 MHz in the U.S. In terms of wavelengths, the range corresponds to

The left part of the figure shows an dipole oscillating in a sinusoidal function. Which of the curves best represents the electric field along the axis of the dipole?

The Sun radiates about 3.83 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 10¹¹ m.

There are many different regions to the electromagnetic spectrum. These include, (a) visible light, (b) gamma-rays, (c) infra-red, (d) micro-waves, (e) radio-waves, (f) ultra-violet, and (g) X-rays. Put them in order of increasing wavelength, starting with the shortest wavelength first.

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 wavelength of a 63.7-MHz electromagnetic wave is approximately

Light wave A has twice the frequency of light wave B. The wavelength of light wave A is _____ that of light wave B.

Which of the following statements is false?

The left part of the figure shows a dipole oscillating in a sinusoidal function. Which of the curves best represents the magnetic field along the axis of the dipole centered about the dipole?

What is the frequency of 555-nm light?

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 radiation intensity at a distance of 2.00 m from the light bulb?

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

A common unit of length in astronomy is the parsec, where 1 parsec = 3.26 light years. How many seconds does it take a radio signal to travel one parsec through space?

The rms value of the electric field in an electromagnetic wave is E_rms = 200 V/m. The intensity of this wave is approximately

Which of the following statements is true?

Which of the following functions satisfy the one-dimensional wave equation?

A parallel-plate capacitor has closely spaced circular plates of radius R = 3.00 cm. Charge is flowing onto the positive plate at the rate I = dQ/dt = 3.65 A. The magnetic field at a distance r = 1.50 cm from the axis of the plates is approximately

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

Exam 10: Maxwells Equations and Electromagnetic Waves

Maxwell's equations

Which of the following groups is arranged in order of increasing wavelength?

The frequency range for FM broadcasts is from 87.9 - 107.9 MHz in the U.S. In terms of wavelengths, the range corresponds to

The left part of the figure shows an dipole oscillating in a sinusoidal function. Which of the curves best represents the electric field along the axis of the dipole?

The Sun radiates about 3.83 *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 *1011 m.

There are many different regions to the electromagnetic spectrum. These include, (a) visible light, (b) gamma-rays, (c) infra-red, (d) micro-waves, (e) radio-waves, (f) ultra-violet, and (g) X-rays. Put them in order of increasing wavelength, starting with the shortest wavelength first.

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 wavelength of a 63.7-MHz electromagnetic wave is approximately

Light wave A has twice the frequency of light wave B. The wavelength of light wave A is _____ that of light wave B.

Which of the following statements is false?

The left part of the figure shows a dipole oscillating in a sinusoidal function. Which of the curves best represents the magnetic field along the axis of the dipole centered about the dipole?

What is the frequency of 555-nm light?

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 radiation intensity at a distance of 2.00 m from the light bulb?

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

A common unit of length in astronomy is the parsec, where 1 parsec = 3.26 light years. How many seconds does it take a radio signal to travel one parsec through space?

The rms value of the electric field in an electromagnetic wave is Erms = 200 V/m. The intensity of this wave is approximately

Which of the following statements is true?

Which of the following functions satisfy the one-dimensional wave equation?

A parallel-plate capacitor has closely spaced circular plates of radius R = 3.00 cm. Charge is flowing onto the positive plate at the rate I = dQ/dt = 3.65 A. The magnetic field at a distance r = 1.50 cm from the axis of the plates is approximately

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 Sun radiates about 3.83 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 10¹¹ m.

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

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 rms value of the electric field in an electromagnetic wave is E_rms = 200 V/m. The intensity of this wave is approximately