Question 1

Which one of the following colors of visible light has the highest frequency?

Accepted Answer

A) yellow 
B) red 
C) green 
D) blue 
E) violet 
A) yellow 
B) red 
C) green 
D) blue 
E) violet E

Question 2

A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 104 W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

Accepted Answer

A) 1.49 × 10-5 W/m2  
B) 5.96 × 10-5 W/m2  
C) 3.73 × 10-6 W/m2 
D) 1.17 × 10-7 W/m2 
E) 5.60 × 10-8 W/m2 
A) 1.49 × 10-5 W/m2  
B) 5.96 × 10-5 W/m2  
C) 3.73 × 10-6 W/m2 
D) 1.17 × 10-7 W/m2 
E) 5.60 × 10-8 W/m2 A

Question 3

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna.  
-To which region of the electromagnetic spectrum does this wave belong?

Accepted Answer

A) X-rays 
B) gamma rays 
C) visible light 
D) infrared radiation 
E) radio waves 
A) X-rays 
B) gamma rays 
C) visible light 
D) infrared radiation 
E) radio waves E

Question 4

Which one of the following statements concerning electromagnetic waves is false?

Accepted Answer

A) Electromagnetic waves are longitudinal waves. 
B) Electromagnetic waves transfer energy through space. 
C) The existence of electromagnetic waves was predicted by Maxwell. 
D) Electromagnetic waves can propagate through a material substance. 
E) Electromagnetic waves do not require a physical medium for propagation. 
A) Electromagnetic waves are longitudinal waves. 
B) Electromagnetic waves transfer energy through space. 
C) The existence of electromagnetic waves was predicted by Maxwell. 
D) Electromagnetic waves can propagate through a material substance. 
E) Electromagnetic waves do not require a physical medium for propagation.

Question 5

When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?

Accepted Answer

A) 7.1 × 1010 Hz 
B) 2.1 × 1014 Hz 
C) 3.0 × 108 Hz 
D) 6.9 × 1011 Hz 
E) 1.4 × 109 Hz 
A) 7.1 × 1010 Hz 
B) 2.1 × 1014 Hz 
C) 3.0 × 108 Hz 
D) 6.9 × 1011 Hz 
E) 1.4 × 109 Hz

Question 6

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna.  
-What is the magnitude of the electric field at t = 3.34 × 10-10 s?

Accepted Answer

A) 2.0 N/C 
B) 5.0 N/C 
C) 7.1 N/C 
D) 10.0 N/C 
E) zero N/C 
A) 2.0 N/C 
B) 5.0 N/C 
C) 7.1 N/C 
D) 10.0 N/C 
E) zero N/C

Question 7

Unpolarized light with an average intensity of 845 W/m2 enters a polarizer with a vertical transmission axis. The transmitted light then enters a second polarizer. The light that exits the second polarizer is found to have an average intensity of 225 W/m2. What is the orientation angle of the second polarizer relative to the first one?

Accepted Answer

A) 54.7° 
B) 22.6° 
C) 43.1° 
D) 77.3° 
E) zero degrees 
A) 54.7° 
B) 22.6° 
C) 43.1° 
D) 77.3° 
E) zero degrees

Question 8

Which one of the following scientists did not attempt to measure the speed of light?

Accepted Answer

A) Galileo 
B) Maxwell 
C) Fizeau 
D) Foucault 
E) Michelson 
A) Galileo 
B) Maxwell 
C) Fizeau 
D) Foucault 
E) Michelson

Question 9

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna.  
-What is the peak value of the magnetic field?

Accepted Answer

A) 1.4 × 10-8 T 
B) 2.3 × 10-8 T 
C) 3.3 × 10-8 T 
D) 4.6 × 10-8 T 
E) 5.4 × 10-8 T 
A) 1.4 × 10-8 T 
B) 2.3 × 10-8 T 
C) 3.3 × 10-8 T 
D) 4.6 × 10-8 T 
E) 5.4 × 10-8 T

Question 10

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction). At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10S1U1P1-S1S1P0S1U1P18S1S1P0 T. The frequency of the wave is 1.0 × 10S1U1P116S1S1P0 Hz.  
-What is the rms value of the magnetic field? Assume that the figure shows the peak value of   .

Accepted Answer

A) 1.0 × 10-8 T 
B) 1.4 × 10-8 T 
C) 2.8 × 10-8 T 
D) 4.6 × 10-8 T 
E) 5.7 × 10-8 T 
A) 1.0 × 10-8 T 
B) 1.4 × 10-8 T 
C) 2.8 × 10-8 T 
D) 4.6 × 10-8 T 
E) 5.7 × 10-8 T

Question 11

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction). At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10S1U1P1-S1S1P0S1U1P18S1S1P0 T. The frequency of the wave is 1.0 × 10S1U1P116S1S1P0 Hz.  
-What is the direction of the electric field?

Accepted Answer

A) It points in the negative y direction. 
B) It points in the positive y direction. 
C) It points in the negative z direction. 
D) It points in the negative x direction. 
E) It points in the positive x direction. 
A) It points in the negative y direction. 
B) It points in the positive y direction. 
C) It points in the negative z direction. 
D) It points in the negative x direction. 
E) It points in the positive x direction.

Question 12

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction). At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10S1U1P1-S1S1P0S1U1P18S1S1P0 T. The frequency of the wave is 1.0 × 10S1U1P116S1S1P0 Hz.  
-What is the wavelength of this electromagnetic wave?

Accepted Answer

A) 0.33 nm 
B) 3.3 nm 
C) 20 nm 
D) 30 nm 
E) 40 nm 
A) 0.33 nm 
B) 3.3 nm 
C) 20 nm 
D) 30 nm 
E) 40 nm

Question 13

Linearly polarized light is incident upon a polarizing sheet that has a transmission axis is parallel to the incident light. The sheet is rotated about its axis through 360° (one complete revolution). At how many positions, including the initial and final positions, will the transmitted intensity be a maximum?

Accepted Answer

A) 6 
B) 5 
C) 4 
D) 3 
E) 2 
A) 6 
B) 5 
C) 4 
D) 3 
E) 2

Question 14

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna.  
-Determine the rms value of the electric field magnitude.

Accepted Answer

A) 7.1 N/C 
B) 12 N/C 
C) 14 N/C 
D) 19 N/C 
E) 28 N/C 
A) 7.1 N/C 
B) 12 N/C 
C) 14 N/C 
D) 19 N/C 
E) 28 N/C

Question 15

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction). At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10S1U1P1-S1S1P0S1U1P18S1S1P0 T. The frequency of the wave is 1.0 × 10S1U1P116S1S1P0 Hz.  
-What is the direction of electromagnetic energy transport?

Accepted Answer

A) the positive x direction 
B) the negative x direction 
C) the positive y direction 
D) the negative y direction 
E) the negative z direction 
A) the positive x direction 
B) the negative x direction 
C) the positive y direction 
D) the negative y direction 
E) the negative z direction

Question 16

The average distance between the surface of the earth and the surface of the sun is 1.49 × 1011 m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

Accepted Answer

A) zero minutes 
B) 2.9 × 10-3 min 
C) 8.3 min 
D) 74 min 
E) 500 min 
A) zero minutes 
B) 2.9 × 10-3 min 
C) 8.3 min 
D) 74 min 
E) 500 min

Question 17

The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of your paper (which is in the -z direction). At time t = 0 s, the wave strikes your paper at normal incidence. The magnetic field vector at point O in the figure points in the -y direction and has a magnitude of 4.0 × 10S1U1P1-S1S1P0S1U1P18S1S1P0 T. The frequency of the wave is 1.0 × 10S1U1P116S1S1P0 Hz.  
-What is the direction of polarization of this electromagnetic wave?

Accepted Answer

A) the x direction 
B) the y direction 
C) the z direction 
D) 45° with respect to the x direction 
E) the wave is not polarized 
A) the x direction 
B) the y direction 
C) the z direction 
D) 45° with respect to the x direction 
E) the wave is not polarized

Question 18

Linearly polarized light is incident of a sheet of polarizing material. The angle between the transmission axis and the incident electric field is 44°. What percentage of the incident intensity is transmitted?

Accepted Answer

A) 38 % 
B) 43 % 
C) 52 % 
D) 72 % 
E) 84 % 
A) 38 % 
B) 43 % 
C) 52 % 
D) 72 % 
E) 84 %

Question 19

Which one of the following wavelengths is in the infrared range of the electromagnetic spectrum?

Accepted Answer

A) 100 mm 
B) 400 nm 
C) 400 m 
D) 2 × 10-15 m 
E) 20 µm 
A) 100 mm 
B) 400 nm 
C) 400 m 
D) 2 × 10-15 m 
E) 20 µm

Question 20

An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10-7 H inductor and a variable capacitor set at 7.31 × 10-12 F. What is the frequency of the radio wave?

Accepted Answer

A) 1.02 × 108 Hz 
B) 8.80 × 107 Hz 
C) 1.58 × 108 Hz 
D) 9.40 × 107 Hz 
E) 9.80 × 107 Hz 
A) 1.02 × 108 Hz 
B) 8.80 × 107 Hz 
C) 1.58 × 108 Hz 
D) 9.40 × 107 Hz 
E) 9.80 × 107 Hz

Exam 24: Electromagnetic Waves

Which one of the following colors of visible light has the highest frequency?

A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 104 W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -To which region of the electromagnetic spectrum does this wave belong?

Which one of the following statements concerning electromagnetic waves is false?

When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the magnitude of the electric field at t = 3.34 × 10-10 s?

Which one of the following scientists did not attempt to measure the speed of light?

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the peak value of the magnetic field?

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -Determine the rms value of the electric field magnitude.

The average distance between the surface of the earth and the surface of the sun is 1.49 × 1011 m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

Linearly polarized light is incident of a sheet of polarizing material. The angle between the transmission axis and the incident electric field is 44°. What percentage of the incident intensity is transmitted?

Which one of the following wavelengths is in the infrared range of the electromagnetic spectrum?

An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10-7 H inductor and a variable capacitor set at 7.31 × 10-12 F. What is the frequency of the radio wave?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

A local radio station transmits radio waves uniformly in all directions with a total power of 7.50 × 10⁴ W. What is the intensity of these waves when they reach a receiving antenna located 20.0 km from the transmitting antenna?

The figure shows the time variation of the magnitude of the electric field of an electromagnetic wave produced by a wire antenna. -What is the magnitude of the electric field at t = 3.34 × 10^-¹⁰ s?

The average distance between the surface of the earth and the surface of the sun is 1.49 × 10¹¹ m. How much time, in minutes, does it take light leaving the surface of the sun to reach the earth?

An FM radio station emits an electromagnetic wave which is received by a circuit containing a 3.33 × 10^-⁷H inductor and a variable capacitor set at 7.31 × 10^-¹² F. What is the frequency of the radio wave?