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21 If 4.8 × 10-17 joule of work is required to move an electron
between two points in an electric field, what is the electric potential difference
between these points?
(1) 1.6 × 10-19 V
(2) 4.8 × 10-17 V
(3) 3.0 × 102 V
(4) 4.8 × 102
V |
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22 The diagram below shows a wire moving to the right at speed v through a uniform
magnetic field that is directed into the page.
As the speed of the wire is increased, the induced potential difference will
(1) decrease
(2) increase
(3) remain the same
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23 A change in the speed of a wave as it enters a new medium produces a change in
(1) frequency
(2) period
(3) wavelength
(4) phase |
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24 Two identical resistors connected in parallel have an equivalent resistance of
40. ohms. What is the resistance of each resistor?
(1) 20.W
(2) 40.W
(3) 80.W
(4) 160W
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25 A tuning fork oscillates with a frequency of 256 hertz after being struck by
a rubber hammer. Which phrase best describes the sound waves produced by this oscillating
tuning fork?
(1) electromagnetic waves that require no medium for transmission
(2) electromagnetic waves that require a medium for transmission
(3) mechanical waves that require no medium for transmission
(4) mechanical waves that require a medium for transmission |
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26 In a vacuum, all electromagnetic waves have the same
(1) wavelength
(2) frequency
(3) speed
(4) amplitude |
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27 The speed of light (f = 5.09 × 1014 Hz) in a transparent material
is 0.75 times its speed in air. The absolute index of refraction of the material
is approximately
(1) 0.75
(2) 1.3
(3) 2.3
(4) 4.
0 |
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28 Waves pass through a 10.-centimeter opening in a barrier without being
diffracted. This observation provides evidence that the wavelength of the waves
is
(1) much shorter than 10. cm
(2) equal to 10. cm
(3) longer than 10. cm, but shorter than 20. cm
(4) longer than 20.
cm |
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29 Standing waves in water are produced most often by periodic water waves
(1) being absorbed at the boundary with a new medium
(2) refracting at a boundary with a new medium
(3) diffracting around a barrier
(4) reflecting from a barrier |
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30 A sound of constant frequency is produced by the siren on top of a firehouse.
Compared to the frequency produced by the siren, the frequency observed by a firefighter
approaching the firehouse is
(1) lower
(2) higher
(3) the same |
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31 White light is passed through a cloud of cool hydrogen gas and then examined
with a spectroscope. The dark lines observed on a bright background are caused by
(1) the hydrogen emitting all frequencies in white light
(2) the hydrogen absorbing certain frequencies of the white light
(3) diffraction of the white light
(4) constructive interference |
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32 Compared to a photon of red light, a photon of blue light has a
(1) greater energy
(2) longer wavelength
(3) smaller momentum
(4) lower frequency |
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33 Protons and neutrons are examples of
(1) positrons
(2) baryons
(3) mesons
(4) quarks |
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34 The strong force is the force of
(1) repulsion between protons
(2) attraction between protons and electrons
(3) repulsion between nucleons
(4) attraction between nucleons |
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35 If a deuterium nucleus has a mass of 1.53 × 10-3 universal
mass units less than its components, this mass represents an energy of
(1) 1.38 MeV
(2) 1.42 MeV
(3) 1.53 MeV
(4) 3.
16 MeV |
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36 Forces A and B have a resultant R. Force A and resultant R are represented in
the diagram below.
Which vector best represents force B?
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37 An object with a net charge of 4.80 × 10-6 coulomb experiences
an electrostatic force having a magnitude of 6.00 × 10-2 newtons
when placed near a negatively charged metal sphere. What is the electric field strength
at this location?
(1) 1.25 × 104 N/C directed away from the sphere
(2) 1.25 × 104 N/C directed toward the sphere
(3) 2.88 × 10-8 N/C directed away from the sphere
(4) 2.88 × 10-8
N/C directed toward the sphere |
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38 What is the approximate width of a person’s little finger?
(1) 1 m
(2) 0.1 m
(3) 0.01 m
(4) 0.
001 m |
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39 The diagram below represents a ray of monochromatic light (f = 5.09 ×
1014 Hz) passing from medium X (n = 1.46) into fused quartz.
Which path will the ray follow in the quartz?
(1) A
(2) B
(3) C
(4) D |
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40 The graph below shows the relationship between the work done by a student and
the time of ascent as the student runs up a flight of stairs.
The slope of the graph would have units of
(1) joules
(2) seconds
(3) watts
(4) newtons |
