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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?

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​Unpolarized light is passed through three successive Polaroid filters, each with its transmission axis at 45.0° to the preceding filter. What percentage of light gets through?


A) ​0%
B) ​12.5%
C) ​25.0%
D) ​50.0%
E) ​33.3%

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

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B

The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 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? A) 120 m B) 240 m C) 60 m D) 100 m E) 360 m 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

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

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


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

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

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The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by in SI units. What is the speed of the EM wave? A) 3 × 108 m/s B) 100 m/s C) 106 m/s D) 2 × 107 m/s E) 2 × 108 m/s in SI units. What is the speed of the EM wave?


A) 3 × 108 m/s
B) 100 m/s
C) 106 m/s
D) 2 × 107 m/s
E) 2 × 108 m/s

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

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In the atmosphere, the shortest wavelength electromagnetic waves are called


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

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

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The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B =


A) The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B = A) . B) . C) E. D) . E) cE. .
B) The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B = A) . B) . C) E. D) . E) cE. .
C) E.
D) The magnetic field amplitude in an electromagnetic wave in vacuum is related to the electric field amplitude by B = A) . B) . C) E. D) . E) cE. .
E) cE.

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

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The correct form of Ampere's law for circuits with gaps in them is


A) The correct form of Ampere's law for circuits with gaps in them is A) . B) . C) . D) . E) . .
B) The correct form of Ampere's law for circuits with gaps in them is A) . B) . C) . D) . E) . .
C) The correct form of Ampere's law for circuits with gaps in them is A) . B) . C) . D) . E) . .
D) The correct form of Ampere's law for circuits with gaps in them is A) . B) . C) . D) . E) . .
E) The correct form of Ampere's law for circuits with gaps in them is A) . B) . C) . D) . E) . .

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

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D

What is the average value of the magnitude of the Poynting vector What is the average value of the magnitude of the Poynting vector at 1 meter from a 100-watt lightbulb radiating in all directions? A) 1 W/m<sup>2</sup> B) 4 W/m<sup>2</sup> C) 2 W/m<sup>2</sup> D) 8 W/m<sup>2</sup> E) 12 W/m<sup>2</sup> at 1 meter from a 100-watt lightbulb radiating in all directions?


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

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

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You can raise the temperature of an object with


A) microwaves.
B) infrared waves.
C) ultraviolet rays.
D) all of the above.
E) only (a) and (b) above.

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

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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.


A) 300 V/m, 10−4 T
B) 1000 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 T

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

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


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 Pa

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

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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 E)
G) None of the above

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

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Green light has a wavelength of 5.4 × 10−7 m. What is the frequency of this EM-wave in air?


A) 5.56 × 1014 Hz
B) 6.00 × 1011 Hz
C) 9.00 × 108 Hz
D) 3.00 × 1010 MHz
E) 1.80 × 1015 Hz

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

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

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

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An FM radio station broadcasts at 98.6 MHz. What is the wavelength of the radiowaves?


A) 60.8 m
B) 6.08 m
C) 3.04 m
D) 0.314 m
E) 0.33 cm

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

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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) ε<sub>0</sub>E<sub>2</sub>. 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) ε<sub>0</sub>E<sub>2</sub>. D) . E) . .
C) ε0E2.
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) ε<sub>0</sub>E<sub>2</sub>. 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) ε<sub>0</sub>E<sub>2</sub>. D) . E) . .

F) B) and E)
G) B) and D)

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A spherical particle of density A spherical particle of density and 2.00-mm radius is located at the same distance from the Sun as the Earth (RSE = 1.5 × 1011 m, G = 6.67 × 10-11 Nm<sup>2</sup>/kg2, S​ = 1365 W/m<sup>2</sup>​, M S = 1.99 × 1030 kg) . If the particle absorbs 100 percent of the sunlight reaching it, the ratio of the force exerted by the solar radiation to the force of gravity exerted on the particle by the Sun is A) 5.8 × 10−5. B) 0.58. C) 1.0. D) 1.7. E) 1.7 × 104. and 2.00-mm radius is located at the same distance from the Sun as the Earth (RSE = 1.5 × 1011 m, G = 6.67 × 10-11 Nm2/kg2, S​ = 1365 W/m2​, M S = 1.99 × 1030 kg) . If the particle absorbs 100 percent of the sunlight reaching it, the ratio of the force exerted by the solar radiation to the force of gravity exerted on the particle by the Sun is


A) 5.8 × 10−5.
B) 0.58.
C) 1.0.
D) 1.7.
E) 1.7 × 104.

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

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


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

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

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