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You can raise the temperature of an object with:


A) microwaves.
B) infrared waves.
C) ultraviolet rays.
D) microwaves, infrared waves and ultraviolet waves.
E) microwaves and infrared rays.

F) C) and D)
G) A) and B)

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


A) 3.3 * 10-6 J
B) 3.3 J
C) 0.003 J
D) 10-4 J
E) 3.0 * 105 J

F) B) and D)
G) A) and B)

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Magnetic fields are produced by:


A) constant electric currents.
B) electric currents that vary sinusoidally with time.
C) time-varying electric fields.
D) all of the above.
E) only (a) and (b) above.

F) B) and C)
G) B) and E)

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The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.What is the wavelength of the EM wave? The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.What is the wavelength of the EM wave? A) 120 m B) 240 m C) 60 m D) 100 m E) 360 m


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

F) B) and D)
G) All of the above

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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?

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In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) A) B) C) D) E)


A) In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) A) B) C) D) E)
B) In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) A) B) C) D) E)
C) In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) A) B) C) D) E)
D) In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) A) B) C) D) E)
E) In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? ( is the velocity of the light wave.) A) B) C) D) E)

F) A) and E)
G) A) and D)

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The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.What is the frequency of the wave? The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.What is the frequency of the wave? A) 500 MHz B) 250 kHz C) 1.25 MHz D) 10 mHz E) 300 MHz


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

F) C) and E)
G) A) and B)

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The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.What is the maximum E-field? The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.What is the maximum E-field? A) 1000 V/m B) 180 V/m C) 81 V/m D) 360 V/m E) 0.40 V/m


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

F) All of the above
G) C) and D)

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The intensity of radiation reaching the Earth from the Sun is 1350 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.)


A) 5.8 * 108 N
B) 1.2 *109 N
C) 2.3*109 N
D) 4.6 *109 N
E) 1.7 * 1017 N

F) B) and D)
G) None of the above

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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 = 1000 W/m2 sunlight.What is the efficiency of the solar cell?


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

F) None of the above
G) B) and E)

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The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.Find the average power per square metre carried by the EM wave. The magnetic field of a plane-polarised electromagnetic wave moving in the z-direction is given by in SI units.Find the average power per square metre carried by the EM wave. A) 720 W B) 172 W C) 500 W D) 2* 107 W E) 86 W


A) 720 W
B) 172 W
C) 500 W
D) 2* 107 W
E) 86 W

F) B) and C)
G) A) and D)

Correct Answer

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When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is:


A) When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is: A) B) C) ( \varepsilon 0E2.) D) E)
B) When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is: A) B) C) ( \varepsilon 0E2.) D) E)
C) ( ε\varepsilon 0E2.)
D) When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is: A) B) C) ( \varepsilon 0E2.) D) E)
E) When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is: A) B) C) ( \varepsilon 0E2.) D) E)

F) A) and B)
G) A) and C)

Correct Answer

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What is the maximum radiation pressure exerted by sunlight in space (S = 1 350 W/m2) on a highly polished silver surface?


A) 1.4 * 10-2 Pa
B) 0.12 Pa
C) 9.0 * 10-6 Pa
D) 4.5 * 10-5 Pa
E) 2.3 *10-6 Pa

F) None of the above
G) C) and D)

Correct Answer

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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 pressure of solar radiation on sphere 2 to that on sphere 1 is:


A) 0.25.
B) 0.50.
C) 1.0.
D) 2.0.
E) 4.0.

F) B) and D)
G) B) and C)

Correct Answer

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Find the force exerted by reflecting sunlight off a reflecting aluminium sheet in space if the area normal to the sunlight is 10 000 m2 and the solar intensity is 1350 W/m2.


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

F) B) and E)
G) None of the above

Correct Answer

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A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain.What is the intensity of the signal at a distance of 10 km?


A) 8 * 10-5 W/m2
B) 8 * 10-6 W/m2
C) 3 * 10-3 W/m2
D) 0.8 W/m2
E) 2.5 * 10-5 W/m2

F) B) and E)
G) B) and C)

Correct Answer

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


A) 3 * 1018 Hz
B) 3 * 1010 MHz
C) 6 *109 Hz
D) 3 *108 Hz
E) 3 * 1020 Hz

F) All of the above
G) A) and C)

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An open circuit consists of a 12 μ\mu F parallel plate capacitor charged to 200 V and a 10 Ω\Omega 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:


A) 1.2 μ\mu A.
B) 2.4 * 10-4 A.
C) 2.4 mA.
D) 10 A.
E) 20 A.

F) All of the above
G) A) and B)

Correct Answer

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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:


A) 0.25.
B) 0.50.
C) 1.0.
D) 2.0.
E) 4.0.

F) B) and C)
G) A) and C)

Correct Answer

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If the maximum E-component of an electromagnetic wave is 600 V/m, what is the maximum B-component?


A) 1.4 T
B) 1.8 * 10-5 T
C) 2.0 * 10-6 T
D) 1.0 * 10-3 T
E) 1.6 *10-10 T

F) A) and B)
G) B) and D)

Correct Answer

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