 January 2002, Part 3
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41  What is the frequency of a wave if its period is 0.25 second?

(1) 1.0 Hz
(2) 0.25 Hz
(3) 12 Hz
(4) 4.0 Hz

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42  What occurs when light passes from water into flint glass?

(1) Its speed decreases, its wavelength becomes shorter, and its frequency remains the same.
(2) Its speed decreases, its wavelength becomes shorter, and its frequency increases.
(3) Its speed increases, its wavelength becomes longer, and its frequency remains the same.
(4) Its speed increases, its wavelength becomes longer, and its frequency decreases.

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43  The diagram below shows straight wave fronts passing through an opening in a barrier. This wave phenomenon is called (1) reflection
(2) refraction
(3) polarization
(4) diffraction

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44  The speed of light in a material is 2.50 × 108 meters per second. What is the absolute index of refraction of the material?

(1) 1.20
(2) 2.50
(3) 7.50
(4) 0.833

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45  An opera singer’s voice is able to break a thin crystal glass when the singer’s voice and the vibrating glass have the same

(1) frequency
(2) speed
(3) amplitude
(4) wavelength

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46  The periodic wave in the diagram below has a frequency of 40. hertz. What is the speed of the wave? (1) 13 m/s
(2) 27 m/s
(3) 60. m/s
(4) 120 m/s

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47  The diagram below represents a rope along which two pulses of equal amplitude, A, approach point P. As the two pulses pass through point P, the maximum vertical displacement of the rope at point P will be (1) A
(2) 2A
(3) 0
(4) A/2

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48  As shown in the diagram below, a transverse wave is moving with velocity v along a rope. In which direction will segment X move as the wave passes through it? (1) down, only
(2) up, only
(3) down, then up, then down
(4) up, then down, then up

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49  How many nodes are represented in the standing wave diagram below? (1) 1
(2) 6
(3) 3
(4) 4

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50  Which phenomenon can not be exhibited by longitudinal waves?

(1) reflection
(2) refraction
(3) diffraction
(4) polarization

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51  An electron in a hydrogen atom drops from the n = 3 energy level to the n = 2 energy level. The energy of the emitted photon is

(1) 1.51 eV
(2) 1.89 eV
(3) 3.40 eV
(4) 4.91 eV

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52  What is the energy of a photon with a frequency of 5.00 × 1014 hertz?

(1) 3.32 eV
(2) 3.20 × 10–6 eV
(3) 3.00 × 1048 J
(4) 3.32 × 10–19 J

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Note that questions 53 through 55 have only three choices.

53  If the diameter of a wire were decreased, its electrical resistance would

(1) decrease
(2) increase
(3) remain the same

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54  An astronomer on Earth studying light coming from a star notes that the observed light frequencies are lower than the actual emitted frequencies. The astronomer concludes that the distance between the star and Earth is

(1) decreasing
(2) increasing
(3) unchanging

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55  Compared to the wavelength of red light, the wavelength of yellow light is

(1) shorter
(2) longer
(3) the same

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Base your answers to question 56 through 58 on the information and diagram below. A ball is thrown horizontally with an initial velocity of 20.0 meters per second from the top of a tower 60.0 meters high. 56  What is the initial vertical velocity of the ball?

(1) 0 m/s
(2) 9.81 m/s
(3) 20.0 m/s
(4) 60.0 m/s

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57  What is the approximate total time required for the ball to reach the ground? [Neglect air resistance.]

(1) 12.2 s
(2) 2.04 s
(3) 3.00 s
(4) 3.50 s

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58  What is the horizontal velocity of the ball just before it reaches the ground? [Neglect air resistance.]

(1) 9.81 m/s
(2) 20.0 m/s
(3) 34.3 m/s
(4) 68.6 m/s

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Base your answers to questions 59 and 60 on the information and diagram below. A 60.-kilogram car travels clockwise in a horizontal circle of radius 10. meters at 5.0 meters per second. 59  The centripetal acceleration of the car at the position shown is directed toward point

(1) A
(2) B
(3) C
(4) D

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60  The magnitude of the centripetal force acting on the car is

(1) 590 N
(2) 150 N
(3) 30. N
(4) 2.5 N Additional Tests
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