Question 1

The Doppler effect applies to sound waves but not to electromagnetic waves.

Accepted Answer

A) True 
 B)False

Question 2

A car is approaching a radio station at a speed of 25.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Accepted Answer

A)   98.3 Hz
B)   6.21 Hz
C)   726 Hz
D)   67.0 Hz
E)   64.5 Hz

Question 3

The total electromagnetic power emitted by the Sun is 3.8 ×1026 W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 1010 m?

Accepted Answer

Question 4

The electric energy density in an electromagnetic wave is higher than its magnetic energy density.

Accepted Answer

A) True 
 B)False

Question 5

A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Accepted Answer

A)   9.93 Hz
B)   99.3 Hz
C)   993 Hz
D)   7.45 Hz
E)   74.5 Hz

Question 6

A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 106 m?

Accepted Answer

A)   0.15 × 10-2 s
B)   15 ms
C)   6.7 × 10-2 s
D)   20 ms
E)   25 ms

Question 7

An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. What is the direction of the electric field vector?

Accepted Answer

A)   Horizontal and pointing south
B)   Vertical and pointing down
C)   Horizontal and pointing north
D)   Vertical and pointing up
E)   Horizontal and pointing east

Question 8

Electromagnetic waves are a result of a stationary electric field and a changing magnetic field.

Accepted Answer

A) True 
 B)False

Question 9

The maximum value of the magnetic field component of an electromagnetic wave is 2.81 μT. What is the rms value of the magnetic field?

Accepted Answer

A)   2.81 μT
B)   2.46 μT
C)   3.12 μT
D)   3.97 μT
E)   1.99 μT

Question 10

A 60.0 W light bulb radiates light uniformly in all different directions. What is the value of E at a distance of 0.400 m from the bulb?

Accepted Answer

A)   162 N/C
B)   212 N/C
C)   82.1 N/C
D)   106 N/C
E)   52.9 N/C

Question 11

In an electromagnetic wave the  and  fields are oriented such that

Accepted Answer

A)   they are parallel to one another and perpendicular to the direction of wave propagation.
B)   they are parallel to one another and parallel to the direction of wave propagation.
C)   they are perpendicular to one another and perpendicular to the direction of wave propagation.
D)   they are perpendicular to one another and parallel to the direction of wave propagation.
E)   None of the above answers is correct.

Question 12

The speed of electromagnetic waves through a vacuum is ten times the speed of sound in air.

Accepted Answer

A) True 
 B)False

Question 13

The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?

Accepted Answer

A)   40 GHz
B)   4.0 GHz
C)   0.75 GHz
D)   75 GHz
E)   7.5 GHz

Question 14

How far does a beam of light travel in one full year?

Accepted Answer

A)   80 × 1012 m
B)   95 × 1014 m
C)   30 × 108 m
D)   20 × 1015 m
E)   36 × 1016 m

Question 15

In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 40.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch. If the distance between the wheel and the mirror is 7890 m, what is the speed of light measured by this experiment?

Accepted Answer

A)   3.00 × 108 m/s
B)   3.00 × 10-8 m/s
C)   3.22 × 108 m/s
D)   3.22 × 10-8 m/s
E)   2.25 × 108 m/s

Question 16

The average intensity of the sunlight in Miami, Florida, is 1040 W/m2. What is the average value of the radiation pressure due to this sunlight in Miami?

Accepted Answer

A)   2.28 × 10-6 N/m2
B)   1.63 × 10-6 N/m2
C)   7.83 × 10-6 N
D)   3.46 × 10-6 N/m2
E)   9.78 × 10-6 N/m2

Question 17

Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?

Accepted Answer

A)   0.10 μT
B)   0.40 μT
C)   0.50 μT
D)   0.60 μT
E)   0.80 μT

Question 18

Unpolarized light of intensity Io passed through a Polaroid sheet with its polarizing axis at the 12 o'clock position and then through a second with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light?

Accepted Answer

Question 19

A laser beam takes 24 ms to be reflected from the surface of a planet. How far from the laser source is this planet's surface?

Accepted Answer

A)   24 × 105 m
B)   12 × 105 m
C)   18 × 105 m
D)   36 × 105 m
E)   48 × 105 m

Question 20

An 8.000-mW laser beam emits a cylindrical beam of light 0.6000 mm in diameter. What is the maximum value of the magnetic field?

Accepted Answer

A)   9.240 × 10-6 T
B)   17.22 × 10-6 T
C)   12.42 × 10-6 T
D)   20.50 × 10-6 T
E)   15.40 × 10-6 T

Exam 25: Electromagnetic Waves

A 60.0 W light bulb radiates light uniformly in all different directions. What is the value of E at a distance of 0.400 m from the bulb?

Correct Answer
verified

A car is approaching a radio station at a speed of 25.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Correct Answer
verified

The speed of electromagnetic waves through a vacuum is ten times the speed of sound in air.

Correct Answer
verified

The average intensity of the sunlight in Miami, Florida, is 1040 W/m². What is the average value of the radiation pressure due to this sunlight in Miami?

Correct Answer
verified

An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. What is the direction of the electric field vector?

Correct Answer
verified

A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 10⁶ m?

Correct Answer
verified

Electromagnetic waves are a result of a stationary electric field and a changing magnetic field.

Correct Answer
verified

A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Correct Answer
verified

In an electromagnetic wave the and fields are oriented such that

Correct Answer
verified

The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?

Correct Answer
verified

Unpolarized light of intensity I_o passed through a Polaroid sheet with its polarizing axis at the 12 o'clock position and then through a second with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light?

Correct Answer
verified

Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?

Correct Answer
verified

An 8.000-mW laser beam emits a cylindrical beam of light 0.6000 mm in diameter. What is the maximum value of the magnetic field?

Correct Answer
verified

The Doppler effect applies to sound waves but not to electromagnetic waves.

Correct Answer
verified

The electric energy density in an electromagnetic wave is higher than its magnetic energy density.

Correct Answer
verified

How far does a beam of light travel in one full year?

Correct Answer
verified

A laser beam takes 24 ms to be reflected from the surface of a planet. How far from the laser source is this planet's surface?

Correct Answer
verified

The maximum value of the magnetic field component of an electromagnetic wave is 2.81 μT. What is the rms value of the magnetic field?

Correct Answer
verified

The total electromagnetic power emitted by the Sun is 3.8 ×10²⁶ W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 10¹⁰ m?

Correct Answer
verified

Correct Answer
verified

Exam 25: Electromagnetic Waves

A 60.0 W light bulb radiates light uniformly in all different directions. What is the value of E at a distance of 0.400 m from the bulb?

Correct AnswerverifiedShow Answer

A car is approaching a radio station at a speed of 25.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Correct AnswerverifiedShow Answer

The speed of electromagnetic waves through a vacuum is ten times the speed of sound in air.

Correct AnswerverifiedShow Answer

The average intensity of the sunlight in Miami, Florida, is 1040 W/m2. What is the average value of the radiation pressure due to this sunlight in Miami?

Correct AnswerverifiedShow Answer

An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. What is the direction of the electric field vector?

Correct AnswerverifiedShow Answer

A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 106 m?

Correct AnswerverifiedShow Answer

Electromagnetic waves are a result of a stationary electric field and a changing magnetic field.

Correct AnswerverifiedShow Answer

A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?

Correct AnswerverifiedShow Answer

In an electromagnetic wave the and fields are oriented such that

Correct AnswerverifiedShow Answer

The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?

Correct AnswerverifiedShow Answer

Unpolarized light of intensity Io passed through a Polaroid sheet with its polarizing axis at the 12 o'clock position and then through a second with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light?

Correct AnswerverifiedShow Answer

Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?

Correct AnswerverifiedShow Answer

An 8.000-mW laser beam emits a cylindrical beam of light 0.6000 mm in diameter. What is the maximum value of the magnetic field?

Correct AnswerverifiedShow Answer

The Doppler effect applies to sound waves but not to electromagnetic waves.

Correct AnswerverifiedShow Answer

The electric energy density in an electromagnetic wave is higher than its magnetic energy density.

Correct AnswerverifiedShow Answer

How far does a beam of light travel in one full year?

Correct AnswerverifiedShow Answer

A laser beam takes 24 ms to be reflected from the surface of a planet. How far from the laser source is this planet's surface?

Correct AnswerverifiedShow Answer

The maximum value of the magnetic field component of an electromagnetic wave is 2.81 μT. What is the rms value of the magnetic field?

Correct AnswerverifiedShow Answer

The total electromagnetic power emitted by the Sun is 3.8 ×1026 W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 1010 m?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The average intensity of the sunlight in Miami, Florida, is 1040 W/m². What is the average value of the radiation pressure due to this sunlight in Miami?

Correct Answer
verified

Correct Answer
verified

A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 20 × 10⁶ m?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Unpolarized light of intensity I_o passed through a Polaroid sheet with its polarizing axis at the 12 o'clock position and then through a second with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The total electromagnetic power emitted by the Sun is 3.8 ×10²⁶ W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 10¹⁰ m?

Correct Answer
verified

Correct Answer
verified