Question 1

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

Question 2

Which of the following statements about electromagnetic waves in free space 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 electric field vector is always at right angles to the magnetic field vector. 
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 electric field vector is always at right angles to the magnetic field vector.

Question 3

The maximum value of the electric field in an electromagnetic wave is 2.0 V/m.What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)

Accepted Answer

A) 6.7 pT 
B) 6.7 mT 
C) 6.7 nT 
D) 6.7 μT 
E) 6.7 T 
A) 6.7 pT 
B) 6.7 mT 
C) 6.7 nT 
D) 6.7 μT 
E) 6.7 T

Question 4

Which one of the following expressions is the correct representation for the speed of light in vacuum?

Accepted Answer

A)    
B)    
C)    
D) 1 /   
E) 1 / ε0μ0 
A)    
B)    
C)    
D) 1 /   
E) 1 / ε0μ0

Question 5

If the magnetic field in a traveling electromagnetic wave has a maximum value of 16.5 nT,what is the maximum value of the electric field associated with this wave? (c = 3.00 × 108 m/s)

Accepted Answer

A) 5.5 × 10-17 V/m 
B) 4.95 V/m 
C) 0.495 V/m 
D) 55.0 × 10-16 V/m 
E) 55.0 × 10-15 V/m 
A) 5.5 × 10-17 V/m 
B) 4.95 V/m 
C) 0.495 V/m 
D) 55.0 × 10-16 V/m 
E) 55.0 × 10-15 V/m

Question 6

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 electric 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 
A) 675.0 V/m 
B) 1604 V/m 
C) 1400 V/m 
D) 1350 V/m 
E) 1010 V/m

Question 7

An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower.The electric field amplitude of the signal at that point is 0.80 V/m.Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed.What is the intensity of the radio signal at that point? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Accepted Answer

A) 8.5 × 10-4 W/m2 
B) 1.2 × 10-3 W/m2 
C) 1.7 × 10-3 W/m2 
D) 6.0 × 10-4 W/m2 
E) 4.2 × 10-4 W/m2 
A) 8.5 × 10-4 W/m2 
B) 1.2 × 10-3 W/m2 
C) 1.7 × 10-3 W/m2 
D) 6.0 × 10-4 W/m2 
E) 4.2 × 10-4 W/m2

Question 8

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 108 m/s)

Accepted Answer

A) 19 ms 
B) 4.5 ms 
C) 5.3 ms 
D) 13 ms 
E) 19 µs 
A) 19 ms 
B) 4.5 ms 
C) 5.3 ms 
D) 13 ms 
E) 19 µs

Question 9

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 km 
A) 1.5 km 
B) 3.0 km 
C) 6.0 km 
D) 9.0 km

Question 10

Which one of the following is not an electromagnetic wave?

Accepted Answer

A) ultraviolet 
B) infrared 
C) radio waves 
D) sound waves 
E) gamma rays 
A) ultraviolet 
B) infrared 
C) radio waves 
D) sound waves 
E) gamma rays

Question 11

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

Question 12

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

Question 13

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 rays 
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 rays

Question 14

A 7.55 ×  
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 
A) 272 nm 
B) 301 nm 
C) 338 nm 
D) 361 nm 
E) 397 nm

Question 15

How far does light travel in 1.0 μs? (c = 3.0 × 108 m/s)

Accepted Answer

A) 3.0 × 1014 m 
B) 0.30 km 
C) 3.0 m 
D) 30 cm 
A) 3.0 × 1014 m 
B) 0.30 km 
C) 3.0 m 
D) 30 cm

Question 16

How much time does it take a beam of light to travel 2.9 km through space? (c = 3.0 × 108 m/s)

Accepted Answer

A) 9.7 s 
B) 9.7 ms 
C) 9.7 μs 
D) 9.7 ns 
E) 9.7 ps 
A) 9.7 s 
B) 9.7 ms 
C) 9.7 μs 
D) 9.7 ns 
E) 9.7 ps

Question 17

The following items are positioned in sequence: A source of a beam of natural light of intensity I0,three ideal polarizers A,B,and C;and an observer.Polarizer axis angles are measured clockwise from the vertical,as viewed by the observer.The axis angle of polarizer A is set at 0° (vertical),and the axis angle of polarizer C is set at 50°.The axis angle of polarizer B is set at 120°.What is ratio of the intensity of the beam at the observer to the intensity I0 of the source?

Accepted Answer

A) 0.015 
B) 0.020 
C) 0.025 
D) 0.030 
E) 0.035 
A) 0.015 
B) 0.020 
C) 0.025 
D) 0.030 
E) 0.035

Question 18

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the magnetic field in the laser beam? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Accepted Answer

A) 9.24 µT 
B) 17.2 µT 
C) 12.4 µT 
D) 20.5 µT 
E) 15.4 µT 
A) 9.24 µT 
B) 17.2 µT 
C) 12.4 µT 
D) 20.5 µT 
E) 15.4 µT

Question 19

For an electromagnetic wave in free space having an electric field of amplitude E and a magnetic field of amplitude B,the ratio of B/E is equal to

Accepted Answer

A) c. 
B) c2. 
C) 1/c. 
D) 1/c2. 
E)    . 
A) c. 
B) c2. 
C) 1/c. 
D) 1/c2. 
E)    .

Question 20

The rate of energy flow per unit area of an electromagnetic wave has an average value of 0.695 W/m2.The wave is incident at right angles upon a rectangular area measuring 1.5 m by 2.0 m.How much total energy falls upon this rectangle each minute? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

Accepted Answer

A) 130 J 
B) 160 J 
C) 190 J 
D) 220 J 
E) 250 J 
A) 130 J 
B) 160 J 
C) 190 J 
D) 220 J 
E) 250 J

Exam 25: Electromagnetic Waves

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

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

The maximum value of the electric field in an electromagnetic wave is 2.0 V/m.What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)

Which one of the following expressions is the correct representation for the speed of light in vacuum?

If the magnetic field in a traveling electromagnetic wave has a maximum value of 16.5 nT,what is the maximum value of the electric field associated with this wave? (c = 3.00 × 108 m/s)

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 electric 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)

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 108 m/s)

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)

Which one of the following is not an electromagnetic wave?

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

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?

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

A 7.55 × 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?

How far does light travel in 1.0 μs? (c = 3.0 × 108 m/s)

How much time does it take a beam of light to travel 2.9 km through space? (c = 3.0 × 108 m/s)

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the magnetic field in the laser beam? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)

For an electromagnetic wave in free space having an electric field of amplitude E and a magnetic field of amplitude B,the ratio of B/E is equal to

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Filters

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

The maximum value of the electric field in an electromagnetic wave is 2.0 V/m.What is the maximum value of the magnetic field in that wave? (c = 3.0 × 10⁸ m/s)

If the magnetic field in a traveling electromagnetic wave has a maximum value of 16.5 nT,what is the maximum value of the electric field associated with this wave? (c = 3.00 × 10⁸ m/s)

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 electric 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)

The distance between two asteroids is 1600 km.How much time does it take for a light signal to go from one asteroid to the other? (c = 3.0 × 10⁸ m/s)

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)

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

A 7.55 × 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?

How far does light travel in 1.0 μs? (c = 3.0 × 10⁸ m/s)

How much time does it take a beam of light to travel 2.9 km through space? (c = 3.0 × 10⁸ m/s)

An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the magnetic field in the laser beam? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)