Basics of Waves Review
Navigate to Answers for:
Questions #1-#14
Questions #15-#26
Questions #27-#38
1. A single disturbance that moves from point to point through a medium is called a ___.
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a. period |
b. periodic wave |
c. wavelength |
d. pulse |
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What is a Wave? |
2. If the particles of the medium are vibrating to and fro in the same direction of energy transport, then the wave is a ____ wave.
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a. longitudinal |
b. sound |
c. standing |
d. transverse |
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Categories of Waves |
3. When the particles of a medium are vibrating at right angles to the direction of energy transport, then the wave is a ____ wave.
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a. longitudinal |
b. sound |
c. standing |
d. transverse |
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Categories of Waves |
4. A transverse wave is traveling through a medium. See diagram below. The particles of the medium are vibrating _____.
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a. parallel to the line joining AD. |
b. along the line joining CI. |
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c. perpendicular to the line joining AD. |
d. at various angles to the line CI. |
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e. along the curve CAEJGBI. |
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Categories of Waves |
5. If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating _____.
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a. from north to south, only |
b. both north and south |
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c. from east to west, only |
d. both east and west |
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Categories of Wave |
6. As a pulse travels though a uniform medium, the speed of the pulse ____.
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a. decreases |
b. increases |
c. remains the same |
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The Speed of a Wave |
7. The main factor which effects the speed of a sound wave is the ____.
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a. amplitude of the sound wave |
b. intensity of the sound |
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c. loudness of the sound |
d. properties of the medium |
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e. pitch of the sound |
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The Speed of a Wave |
8. As a wave travels into a medium in which its speed increases, its wavelength would ____.
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a. decrease |
b. increase |
c. remain the same |
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The Wave Equation |
9. As a wave passes across a boundary into a new medium, which characteristic of the wave would NOT change?
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a. speed |
b. frequency |
c. wavelength |
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The Speed of a Wave |
10. What is the amplitude of the wave in the diagram below?
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a. 0.03 m. |
b. 0.04 m. |
c. 0.05 m. |
d. 0.06 m. |
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The Anatomy of a Wave |
11. The wavelength of the wave in the diagram above (Question #10) is ____ m.
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a. 0.030 |
b. 0.040 |
c. 0.060 |
d. 0.080 |
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The Anatomy of a Wave |
12. A wave X meters long passes through a medium with a speed of Y meters per second. The frequency of the wave could be expressed as
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a. Y/X cycles/sec. |
b. X/Y cycles/sec. |
c. XY cycles/sec. |
d. (X + Y) cycles/sec. |
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The Wave Equation |
Consider the following diagram for Questions #13-#14.
13. How many complete waves are shown in the diagram?
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a. 1 |
b. 2 |
c. 3 |
d. 1.5 |
14. If the distance from point A to point B in the diagram is 60 cm, then the wavelength is ____.
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a. 20 cm. |
b. 40 cm. |
c. 60 cm. |
d. 90 cm. |
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The Anatomy of a Wave |
15. The number of cycles of a periodic wave occurring per unit time is defined as a wave's ____.
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a. wavelength. |
b. period. |
c. amplitude. |
d. frequency. |
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Frequency and Period of a Wave |
16. A periodic and repeating disturbance in a lake creates waves which emanate outward from its source to produce circular wave patterns. If the frequency of the source is 2.00 Hz and the wave speed is 5.00m/s then the distance between adjacent wave crests is ___ meter.
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a. 0.200 |
b. 0.400 |
c. 1.25 |
d. 2.50 |
e. 10.0 |
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The Anatomy of a Wave | The Wave Equation |
17. What is the frequency of a wave that has a speed of 0.4 m/s and a wavelength of 0.020 meter?
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a. 10 hertz. |
b. 20 hertz. |
c. 0.008 hertz. |
d. 0.5 hertz. |
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The Wave Equation |
18. Many wave properties are dependent upon other wave properties. Yet, one wave property is independent of all other wave properties. Which one of the following properties of a wave is independent of all the others?
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a. wavelength |
b. frequency |
c. period |
d. velocity |
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The Speed of a Wave |
19. A pendulum makes exactly 40 vibrations in 20.0 s. Its period is ____. (Be cautious of the units.)
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a. 0.500 Hz. |
b. 0.500 s. |
c. 2.00 Hz. |
d. 2.00 s. |
e. 8.00 x 102 Hz. |
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Frequency and Period of a Wave |
20. A period of 0.005 seconds would be equivalent to a frequency of ____ Hz.
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a. 20 |
b. 50 |
c. 200 |
d. 500 |
e. 2000 |
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Frequency and Period of a Wave |
21. TRUE or FALSE:
The number of waves generated per second by a source is called the frequency of the source.
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a. True |
b. False |
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Frequency and Period of a Wave |
22. TRUE or FALSE:
The SI unit for frequency is hertz.
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a. True |
b. False |
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Frequency and Period of a Wave |
23. TRUE or FALSE:
Doubling the frequency of a wave source (without altering the medium) doubles the speed of the waves.
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a. True |
b. False |
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The Wave Equation |
24. If the frequency of a wave is doubled and if the speed remains constant, its wavelength is ____.
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a. quartered. |
b. halved. |
c. unchanged. |
d. doubled. |
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The Wave Equation |
25.
Two different ropes with different mass densities are attached to
each other. A pulse is introduced into one end of the rop and
approaches the boundary as shown at the right. At the boundary, a
portion of the energy is transmitted into the new medium and a
portion is reflected. Which one of the diagrams below depicts the
possible location and orientation of the pulse shortly after the
incident pulse reaches the boundary?
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Boundary Behavior |
26. When a pulse reaches a boundary between two different media, it will be____.
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a. reflected, only. |
b. transmitted, only. |
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c. partly reflected and partly transmitted. |
d. neither reflected nor transmitted. |
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Boundary Behavior |
27.
Diagram P at the right shows a transverse pulse traveling along a
dense rope toward its junction with a less dense rope. Which of the
diagrams (A, B, C, D, or E) below depicts the ropes at the instant
that the reflected pulse again passes through its original position
marked X? Consider such features as amplitude and relative speed
(i.e., the relative distance of the transmitted and reflected pulses
from boundary).
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Boundary Behavior |
28. A wave whose speed in a snakey is 4.4 m/s enters a second snakey. The wavelength changes from 2.0 m to 3.0 m. The wave in the second snakey travels at approximately ____.
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a. 1.5 m/s. |
b. 2.2 m/s. |
c. 2.9 m/s. |
d. 4.4 m/s. |
e. 6.6 m/s. |
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Boundary Behavior |
29.
The diagram at the right shows a disturbance moving through a rope
towards the right. If this disturbance meets a similar disturbance
moving to the left, then which one of the diagrams below depict a
pattern which could NEVER appear in the rope?
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Boundary Behavior |
30. A 2.0-meter long rope is hanging vertically from the ceiling and attached to a vibrator. A single pulse is observed to travel to the end of the rope in 0.50 s. What frequency should be used by the vibrator to maintain three whole waves in the rope?
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a. 0.75 Hz |
b. 1.3 Hz |
c. 4.0 Hz |
d. 6.0 Hz |
e. 8.0 Hz |
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The Wave Equation |
31. A standing wave experiment is performed to determine the speed of waves in a rope. The standing wave pattern shown below is established in the rope. The rope makes exactly 90 complete vibrational cycles in one minute. The speed of the waves is ____ m/s.
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a. 3.0 |
b. 6.0 |
c. 180 |
d. 360 |
e. 540 |
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The Wave Equation |
32. Consider the standing wave pattern shown below. A wave generated at the left end of the medium undergoes reflection at the fixed end on the right side of the medium. The number of antinodes in the diagram is _____.
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a. 3 |
b. 5 |
c. 6 |
d. 7 |
e. 12 |
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Nodes and Anti-nodes |
33. A node is a point located along the medium where there is always ___.
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a. a double crest |
b. a double trough |
c. constructive interference |
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d. destructive interference |
e. a double rarefaction |
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Nodes and Anti-nodes |
34. TRUE or FALSE:
Constructive interference of waves occurs when two crests meet.
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a. True |
b. False |
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Interference of Waves |
35. Which phenomenon is produced when two or more waves passing simultaneously through the same medium meet up with one another?
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a. refraction |
b. diffraction |
c. interference |
d. reflection |
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Interference of Waves |
36. Two pulses are traveling in opposite directions along the same medium as shown in the diagram at the right. Which diagram below best depicts the appearance of the medium when each pulse meets in the middle?
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Interference of Waves |
37. TRUE or FALSE:
A vibrating object is necessary for the production of sound.
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a. True |
b. False |
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Sound is a Mechanical Wave |
38. Which one of the following CANNOT transmit sound?
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a. Liquid air |
b. Gaseous oxygen |
c. Liquid water |
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d. Solid steel |
e. Perfect vacuum |
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Sound is a Mechanical Wave |