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In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 55.0 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 8800 m, how much time does it take the wheel to rotate from one notch to the next?


A) 11.9 s
B) 24.8 s
C) 3.83 × 10-5 s
D) 7.44 × 10-5 s
E) 8.44 × 10-5 s

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

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A 60.0-W light bulb radiates light uniformly in all different directions. What is the value of B at a distance of 0.700 m from the bulb?


A) 1.76 × 10-7 T
B) 2.02 × 10-7 T
C) 2.22 × 10-7 T
D) 4.86 × 10-7 T
E) None of the other answers is correct.

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

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A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves?


A) 442 Hz
B) 351 Hz
C) 419 Hz
D) 322 Hz
E) 670 Hz

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

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In 1676 Romer announced what value for the speed of light?


A) 2.55 × 108 m/s
B) 2.99 × 108 m/s
C) 1.99 × 108 m/s
D) 3.13 × 108 m/s
E) 2.25 × 108 m/s

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

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The frequency of a microwave signal is 9.76 GHz. What is its wavelength in meters?


A) 3.07 × 10-2 m
B) 2.07 × 10-2 m
C) 1.07 × 10-2 m
D) 5.07 × 10-2 m
E) 4.07 × 10-2 m

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

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A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the lowest frequency associated with this portion of the spectrum?


A) 1.50 × 1014 Hz
B) 7.50 × 1013 Hz
C) 7.50 × 1014 Hz
D) 7.50 × 1015 Hz
E) 1.50 × 1015 Hz

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

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Unpolarized light of intensity I passes through four Polaroid sheets whose polarizing angles are rotated 30° from each other so that the last sheet is aligned at 90° to the first. What is the intensity of the light emerging from the fourth sheet?

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An electromagnetic wave is a result of electric and magnetic fields acting together.

A) True
B) False

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The first scientific attempt to measure the speed of light was made by


A) Galileo.
B) Faraday.
C) Maxwell.
D) Newton.
E) Romer.

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

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A vertically polarized beam of light of intensity 100 W/m2 passes through two polarizers. The first polarizer is making an angle of 20° with its transmission axis and the second one is making an angle of 40° with its transmission axis. What is the transmitted intensity of this beam of light?


A) 22.2 W/m2
B) 44.4 W/m2
C) 66.6 W/m2
D) 78.0 W/m2
E) 11.7 W/m2

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

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The rms value of the electric field component of an electromagnetic wave is 27.2 N/C. What is the maximum value of the electric field?


A) 38.5 N/C
B) 19.2 N/C
C) 27.2 N/C
D) 47.4 N/C
E) 52.8 N/C

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

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The value of the magnetic field for a certain type of electromagnetic wave is 2.12 μT. What is the value of the electric field for that wave?


A) 636 V/m
B) 636 N/C
C) 636 J/Cm
D) All of the answers given are correct.
E) None of the answers given is correct.

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

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A radio station broadcasts at a frequency of 80 MHz. How far will this signal travel in 67 ms?


A) 60 × 106 m
B) 67 m
C) 40 × 106 m
D) 80 m
E) 20 × 106 m

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

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A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the highest frequency associated with this portion of the spectrum?


A) 1.50 × 1014 Hz
B) 7.50 × 1013 Hz
C) 7.50 × 1014 Hz
D) 7.50 × 1015 Hz
E) 1.50 × 1015 Hz

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

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Object A in the shape of a disk of radius r is placed a distance R away from an intense light source. Object B, made from the same material as object A, is in the shape of a disk of radius 2r and placed a distance 2R away from the same light source. We observe which of the following?


A) Both objects experience the same amount of radiation pressure but receive different amounts of linear momentum.
B) The objects experience different amounts of radiation pressure and receive different amounts of linear momentum.
C) Both objects experience the same amount of radiation pressure and the same amount of linear momentum.
D) The objects experience different amounts of radiation pressure but receive the same amount of linear momentum.

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

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The energy density of an electromagnetic wave is


A) entirely in the electric field.
B) entirely in the magnetic field.
C) 1/4 in the electric field and 3/4 in the magnetic field.
D) 1/4 in the magnetic field and 3/4 in the electric field.
E) equally divided between the magnetic and the electric fields.

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

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The magnetic field component of the electromagnetic wave is 15.0 μT. What is the magnetic energy density of the wave?


A) 2.26 × 10-4 J/m3
B) 8.95 × 10-5 J/m2
C) 1.79 × 10-4 J/m3
D) 4.47 × 10-4 J/m2
E) 9.72 × 10-5 J/m3

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

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Which one of the following is the correct representation of the electromagnetic waves from longer wavelength to shorter wavelength?


A) radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays
B) radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays
C) radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays
D) radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays
E) radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays

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

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Which one of the following is the correct representation of the relationship between the speed of a wave (v) , frequency of the wave (f) , and its wavelength (λ) ?


A) v = 2λ
B) v = 2f
C) v = λ/f
D) v = fλ
E) v = f/λ

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

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The average electric energy density of an electromagnetic wave is 0.600 × 10-7 J/m3. What is the electric field component of this wave?


A) 116 J/Cm
B) 116 N/C
C) 116 V/m
D) All of the answers given are correct.
E) None of the answers given is correct.

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

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