Question 1

What should be the height of a dipole antenna (of dimensions 1/4 wavelength)  if it is to transmit 1200 kHz radiowaves?

Accepted Answer

A)   11.4 m
B)   60 cm
C)   1.12 m
D)   62.5 m
E)   250 mF) D) and E)
G) A) and B) D

Question 2

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 7 W E)  86 W" class="answers-bank-image d-inline" rel="preload" > in SI units. Find the average power per square meter carried by the EM wave.

Accepted Answer

A)   720 W
B)   172 W
C)   500 W
D)   2 × 107 W
E)   86 WF) B) and D)
G) C) and D)

Question 3

Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1)  and 2R (sphere 2)  from the sun respectively. The ratio of the gravitational force exerted by the sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2. The ratio of T2 to T1 is

Accepted Answer

A)   0.25.
B)   0.50.
C)   1.0.
D)   2.0.
E)   4.0.F) D) and E)
G) All of the above

Question 4

At a distance of 10 km from a radio transmitter, the amplitude of the E-field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?

Accepted Answer

A)   10 kW
B)   67 kW
C)   140 kW
D)   245 kW
E)   21 kWF) A) and D)
G) C) and D)

Question 5

Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10−4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?

Accepted Answer

Question 6

The sun radiates energy at a rate of 3.86 × 1026 W. Its radius is 7.0 × 108 m. If the distance from the Earth to the sun is 1.5 × 1011 m, what is the intensity of solar radiation at the top of the Earth's atmosphere?

Accepted Answer

Question 7

How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?

Accepted Answer

A)   3.3 × 10−6 J
B)   3.3 J
C)   0.003 J
D)   10−4 J
E)   3.0 × 105 JF) All of the above
G) D) and E)

Question 8

What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2)  on a flat black surface?

Accepted Answer

A)   2.25 × 10−5 Pa
B)   0.06 Pa
C)   7 × 10−4 Pa
D)   4.5 × 10−6 Pa
E)   9.0 × 10−6 PaF) C) and E)
G) A) and B)

Question 9

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by  in SI units. What is the maximum E-field?

Accepted Answer

A)   1000 V/m
B)   180 V/m
C)   81 V/m
D)   360 V/m
E)   0.40 V/mF) C) and D)
G) B) and C) D

Question 10

If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B.

Accepted Answer

A)   300 V/m, 10−4 T
B)   1 000 V/m, 3.35 × 10−6 T
C)   225 V/m, 1.60× 10−3 T
D)   111 V/m, 3.00 × 10−5 T
E)   711 V/m, 2.37 × 10−6 TF) B) and E)
G) A) and C)

Question 11

What is the average value of the magnitude of the Poynting vector 2 B)  4 W/m2 C)  2 W/m2 D)  8 W/m2 E)  12 W/m2" class="answers-bank-image d-inline" rel="preload" > at 1 meter from a 100-watt lightbulb radiating in all directions?

Accepted Answer

A)   1 W/m2
B)   4 W/m2
C)   2 W/m2
D)   8 W/m2
E)   12 W/m2F) B) and E)
G) A) and E)

Question 12

Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10000 m2 and the solar intensity is 1350 W/m2.

Accepted Answer

A)   0.72 N
B)   0.09 N
C)   9 N
D)   45 N
E)   0.18 NF) A) and D)
G) A) and B)

Question 13

Find the frequency of X-rays of wavelength 1 Å = 10−10 m.

Accepted Answer

A)   3 × 1018 Hz
B)   3 × 1010 MHz
C)   6 × 109 Hz
D)   3 × 108 Hz
E)   3 × 1020 HzF) None of the above
G) A) and B)

Question 14

The intensity of radiation reaching the earth from the sun is 1 350 W/m2. The earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)

Accepted Answer

A)   5.8 × 108 N
B)   1.2 × 109 N
C)   2.3 × 109 N
D)   4.6 × 109 N
E)   1.7 × 1017 NF) A) and D)
G) B) and C)

Question 15

An open circuit consists of a 12 μF parallel plate capacitor charged to 200 V and a 10 Ω resistor. At the instant when a switch closes the circuit (with no battery in it)  the displacement current between the plates of the capacitor is

Accepted Answer

A)   1.2 μA.
B)   2.4 × 10−4 A.
C)   2.4 mA.
D)   10 A.
E)   20 A.F) A) and D)
G) A) and C)

Question 16

In the atmosphere, the shortest wavelength electromagnetic waves are called

Accepted Answer

A)   microwaves.
B)   infrared waves.
C)   ultraviolet waves.
D)   X-rays.
E)   gamma rays.F) C) and D)
G) B) and E)

Question 17

A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC)  when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?

Accepted Answer

A)   16%
B)   7%
C)   23%
D)   4%
E)   32%F) A) and B)
G) A) and E)

Question 18

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by  in SI units. What is the frequency of the wave?

Accepted Answer

A)   500 MHz
B)   250 kHz
C)   1.25 MHz
D)   10 mHz
E)   300 MHzF) C) and E)
G) D) and E) C

Question 19

The speed of light is given by the value of

Accepted Answer

A)   ε0μ0.
B)  0μ0. 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
C)  0μ0. 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
D)  0μ0. 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .
E)  0μ0. 
B)     . 
C)     . 
D)     . 
E)     ." class="answers-bank-image d-inline" rel="preload" > .F) All of the above
G) A) and E)

Question 20

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by  in SI units. What is the wavelength of the EM wave?

Accepted Answer

A)   120 m
B)   240 m
C)   60 m
D)   100 m
E)   360 mF) B) and D)
G) B) and E)

Exam 34: Electromagnetic Waves

What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1200 kHz radiowaves?

Correct Answer
verified
D

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. Find the average power per square meter carried by the EM wave.

Correct Answer
verified

Correct Answer
verified

At a distance of 10 km from a radio transmitter, the amplitude of the E-field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?

Correct Answer
verified

Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10−⁴ T. How much energy is stored in 1.0 m³ of the atmosphere because of this field?

Correct Answer
verified

The sun radiates energy at a rate of 3.86 × 10²⁶ W. Its radius is 7.0 × 10⁸ m. If the distance from the Earth to the sun is 1.5 × 10¹¹ m, what is the intensity of solar radiation at the top of the Earth's atmosphere?

Correct Answer
verified

How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m²?

Correct Answer
verified

What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m²) on a flat black surface?

Correct Answer
verified

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the maximum E-field?

Correct Answer
verified
D

If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m², calculate the peak values of E and B.

Correct Answer
verified

What is the average value of the magnitude of the Poynting vector at 1 meter from a 100-watt lightbulb radiating in all directions?

Correct Answer
verified

Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10000 m² and the solar intensity is 1350 W/m².

Correct Answer
verified

Find the frequency of X-rays of wavelength 1 Å = 10−¹⁰ m.

Correct Answer
verified

The intensity of radiation reaching the earth from the sun is 1 350 W/m². The earth's radius is 6.4 × 10⁶ m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)

Correct Answer
verified

An open circuit consists of a 12 μF parallel plate capacitor charged to 200 V and a 10 Ω resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is

Correct Answer
verified

In the atmosphere, the shortest wavelength electromagnetic waves are called

Correct Answer
verified

A solar cell has a light-gathering area of 10 cm² and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m² sunlight. What is the efficiency of the solar cell?

Correct Answer
verified

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the frequency of the wave?

Correct Answer
verified
C

The speed of light is given by the value of

Correct Answer
verified

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the wavelength of the EM wave?

Correct Answer
verified

Exam 34: Electromagnetic Waves

What should be the height of a dipole antenna (of dimensions 1/4 wavelength) if it is to transmit 1200 kHz radiowaves?

Correct AnswerverifiedD

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. Find the average power per square meter carried by the EM wave.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

At a distance of 10 km from a radio transmitter, the amplitude of the E-field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?

Correct AnswerverifiedShow Answer

Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10−4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?

Correct AnswerverifiedShow Answer

The sun radiates energy at a rate of 3.86 × 1026 W. Its radius is 7.0 × 108 m. If the distance from the Earth to the sun is 1.5 × 1011 m, what is the intensity of solar radiation at the top of the Earth's atmosphere?

Correct AnswerverifiedShow Answer

How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?

Correct AnswerverifiedShow Answer

What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a flat black surface?

Correct AnswerverifiedShow Answer

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the maximum E-field?

Correct AnswerverifiedD

If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B.

Correct AnswerverifiedShow Answer

What is the average value of the magnitude of the Poynting vector at 1 meter from a 100-watt lightbulb radiating in all directions?

Correct AnswerverifiedShow Answer

Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10000 m2 and the solar intensity is 1350 W/m2.

Correct AnswerverifiedShow Answer

Find the frequency of X-rays of wavelength 1 Å = 10−10 m.

Correct AnswerverifiedShow Answer

The intensity of radiation reaching the earth from the sun is 1 350 W/m2. The earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)

Correct AnswerverifiedShow Answer

An open circuit consists of a 12 μF parallel plate capacitor charged to 200 V and a 10 Ω resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is

Correct AnswerverifiedShow Answer

In the atmosphere, the shortest wavelength electromagnetic waves are called

Correct AnswerverifiedShow Answer

A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?

Correct AnswerverifiedShow Answer

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the frequency of the wave?

Correct AnswerverifiedC

The speed of light is given by the value of

Correct AnswerverifiedShow Answer

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the wavelength of the EM wave?

Correct AnswerverifiedShow Answer

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10−⁴ T. How much energy is stored in 1.0 m³ of the atmosphere because of this field?

Correct Answer
verified

The sun radiates energy at a rate of 3.86 × 10²⁶ W. Its radius is 7.0 × 10⁸ m. If the distance from the Earth to the sun is 1.5 × 10¹¹ m, what is the intensity of solar radiation at the top of the Earth's atmosphere?

Correct Answer
verified

How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m²?

Correct Answer
verified

What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m²) on a flat black surface?

Correct Answer
verified

Correct Answer
verified
D

If the radiant energy from the sun comes in as a plane EM wave of intensity 1340 W/m², calculate the peak values of E and B.

Correct Answer
verified

Correct Answer
verified

Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10000 m² and the solar intensity is 1350 W/m².

Correct Answer
verified

Find the frequency of X-rays of wavelength 1 Å = 10−¹⁰ m.

Correct Answer
verified

The intensity of radiation reaching the earth from the sun is 1 350 W/m². The earth's radius is 6.4 × 10⁶ m. How big a force does this radiation exert on the earth? (Assume it is all absorbed.)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A solar cell has a light-gathering area of 10 cm² and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m² sunlight. What is the efficiency of the solar cell?

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified