Final Review Questions
Final will be Multiple Choice
1. The number of cycles or vibrations per unit of time is called:
2. An amusement park ride has a frequency of 0.25 Hz. What is the ride’s period?
3. An amusement park ride swings back and forth once every 10.0 s. What is the ride’s frequency?
4.
Use the picture above for the following questions. Assume a mass of 50.0 kg, a spring constant of 350 N/m and an initial release position of 1.50 m from equilibrium. (the mass is released from rest)
a. What is the period of oscillation?
b. What is the frequency of oscillation?
c. What is the force exerted on the block at 1.50 m?
d. What is the amplitude of the system?
e. What is the maximum displacement of the system?
f. What is the maximum speed of the system?
g. What is the speed of the block when it has a displacement of 1.0 meters from equilibrium?
h. What is the displacement of the block when it has a speed of 1.0 m/s?
i. What is the MAX PE of the system?
j. What is the MAX KE of the system?
k. What is the Total Energy of the system?
l. What is the PE at x =1.0m? KE?
m. What is the KE at v =1.0m/s? PE?
5.
6. In the waveform of the longitudinal wave shown above, the compressed regions correspond to ______and the the stretched regions correspond to ______.
7. A periodic wave has a wavelength of 0.50 m and a speed of 20 m/s. What is the wave frequency?
8. A musical tone sounded on a piano has a frequency of 410 Hz and a wavelength of 0.80 m. What is the speed of the sound wave?
9. A radio wave has a speed of 3.00 ´ 108 m/s and a frequency of 107 MHz. What is the wavelength?
10. Bats can detect small objects, such as insects, that are approximately the size of one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of sound waves in air is 330 m/s, what is the size of the smallest insect that the bat can detect?
11. Waves propagate along a stretched string at a speed of 8.0 m/s. The end of the string vibrates up and down once every 1.5 s. What is the wavelength of the waves traveling along the string?
12.
13. What types of interference will occur in the figures above?
14. What occurs when a mechanical wave is incident to a fixed boundary? a free boundary?
15. What is the fewest number of nodes and anti-nodes a standing wave can have? (Open pipe, Closed pipe)
16. How high or low we perceive a sound to be, depending on the frequency of the sound wave, is defined as the
17. As a sound source approaches and then moves past a stationary observer, what shift in frequency wiil the observer hear?
18. Two sounds have a difference of 50 dB. How much more power does the louder sound have?
19. What is the lowest frequency that will resonate in a 3.0 m length organ pipe closed at one end? The speed of sound in air at this temperature is 340 m/s.
20. If a guitar string has a fundamental frequency of 500 Hz, what is the frequency of its second harmonic?
21. What phenomenon is created by two tuning forks side by side that emit frequencies that differ by only a small amount?
22. Two vibrating tuning forks held side by side will create a beat frequency of what value if the individual frequencies of the two forks are 342 Hz and 345 Hz, respectively?
23. In a vacuum, how does the speed of radio waves compare to the speed of x-rays?
24. Compare the speed, wavelength and frequency of red light with violet light.
25. If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is
26. If a light ray strikes a flat mirror at an angle of 37° from the normal, the reflected ray will be
27. The image of an object in a flat mirror is always: (3 things)
28. If you stand 3.0 m in front of a flat mirror, how far away from you would your image be in the mirror?
29. A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How far from the mirror is the corresponding object?
30. If a virtual image is formed 10.0 cm along the principal axis from a convex mirror with a focal length of –15.0 cm, what is the object’s distance from the mirror?
31.
32. In the diagram above, the image of object B would be
33. When blue light and green light shine on the same place on a piece of white paper, the spot appears to be
34. What color does yellow pigment subtract from white light?
35. What color does blue pigment subtract from white light?
36. If you looked at a light through the lenses from two polarizing sunglasses that were overlapped at right angles to one another,
37. Give an example of refraction?
38. When light passes at an angle to the normal from one material into another material in which its speed is lower, the light is bent ______the normal.
39. When a light ray passes from water (n = 1.333) into diamond (n = 2.419) at an angle of 45°, what is the angle of refraction?
40. An object is placed along the principal axis of a thin converging lens that has a focal length of 30.0 cm. If the distance from the object to the lens is 40.0 cm, what is the distance from the image to the lens?
41. What will happen to a light ray incident on a glass-to-air boundary at an angle greater than the critical angle?
42. What happens when a rubber rod is rubbed with a piece of fur, giving it a negative charge?
43. What is an electric insulator?
44. What is induction? (Draw a picture)
45. If two point charges are separated by 1.5 cm and have charge values of 2.0mCand–4.0 mC, respectively, what is the value of the mutual force between them? (kc = 8.99 ´ 109 N·m2/C2)
46. Consider a thundercloud that has an electric charge of 40.0 C near the top of the cloud and –40.0 C near the bottom of the cloud. These charges are separated by about 2.0 km. What is the electric force between these two sets of charges? (kc = 8.99 ´ 109 N·m2/C2)
47. What is different between gravitational and electric forces?
48. Two point charges, initially 2 cm apart, are moved to a distance of 10 cm apart. By what factor do the resulting electric and gravitational forces between them change?
49. When does charge build up between the plates of a capacitor stop?
50. A capacitor consists of two metal plates; ____ is stored on one plate and ____ is stored on the other.
51. A 0.25 mF capacitor is connected to a 9.0 V battery. What is the charge on the capacitor?
52. A wire carries a steady current of 0.1 A over a period of 20 s. What total charge moves through the wire in this time interval?
53. The amount of charge that moves through the filament of a light bulb in 2.00 s is 2.67 C. What is the current in the light bulb?
54. What is the potential difference across a resistor of 5.0 W that carries a current of 5.0 A?
55. .A flashlight bulb with a potential difference of 4.5 V across it has a resistance of 8.0 W. How much current is in the bulb filament?
56. If a 75 W light bulb operates at a voltage of 120 V, what is the current in the bulb?
57. If a 325 W heater has a current of 6.0 A, what is the resistance of the heating element?
58. If a lamp is measured to have a resistance of 45 W when it operates at a power of 80 W, what is the current in the lamp?
59. According to Lenz’s law, the magnetic field of an induced current in a conductor will ______.
60. A generator supplies an rms current of 1.66 A. If the resistance of the circuit is 66.0 W, what is the maximum emf?
61. An electric motor depends on the conversion of ______to ______.
62. Which conversion process is the basic function of the electric generator?
63. Two loops of wire are arranged so that a changing current in the primary will induce a current in the secondary. The secondary loop has twice as many turns as the primary loop. As long as the current in the primary is steady at 3.0 A, the current in the secondary will be
64. A step-up transformer used on a 120 V line has 95 turns on the primary and 2850 turns on the secondary. What is the potential difference across the secondary?
65. A step-down transformer has 2500 turns on its primary and 150 turns on its secondary. If the potential difference across the primary is 4850 V, what is the potential difference across the secondary?
66. A transformer has 15 turns in its primary and 6750 turns in its secondary. If the potential difference across the primary is 1.2 V, what is the potential difference across the secondary?
67. An ammeter should be connected in ______and a voltmeter connected in ______
68. A person standing in a waist-deep pool appears to have short legs because of light
69. The equivalent resistance of a 100.0W resistor and a 30.0W resistor connected in parallel is
70. An electron which moves with a speed of 3.00 x 104 m/s perpendicular to a uniform magnetic field of 0.400 T experiences a force of what magnitude?
71. A thin copper rod 1.00 m long has a mass of 0.0500 kg. What is the minimum current in the rod that would allow it to "float" in a magnetic field of 0.100 T?
72. If three resistors are connected in parallel, there are ______current paths in the circuit.
73. The change in the direction of waves at a boundary between two different media is
74. What happens when a bar magnet is broken into two pieces,
75. A standing wave set up in a 2.5 m long organ pipe (which is open at both ends) will have a fundamental tone for what wavelength?
76. What was the major significance of the Millikan Oil Drop Experiment?
77. What is the equation for illumenance 5.0 meters from a small light source of 250 Lumens?
78. Light is incident at an angle of 28.0° (From the tangent) on a lake. At what angle is the ray refracted? (The index of refraction for water is 1.33)
79. Find the critical angle for a light ray traveling from plastic (n=1.73) to air.
80. A rainbow is a phenomenon caused by what 2 phenomena?
81. The convex lens of a copy machine has a focal length of 19.5 cm. A picture to be copied is 37.3 cm away from the lens. Will the copy be an enlargement or reduction?
82. An electron is in the presence of an electric field of 300 N/C. What force does the electron experience?