Physics Oscillations and Waves Scheme a Review Answers
Nuts of Waves Review
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1. A single disturbance that moves from bespeak to betoken through a medium is called a ___.
| a. menses | b. periodic wave | c. wavelength | d. pulse |
Answer: D
A wave is a continuous and repeating disturbance of a medium and a pulse is a single disturbance.
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2. If the particles of the medium are vibrating to and fro in the same direction of energy transport, so the moving ridge is a ____ wave.
| a. longitudinal | b. sound | c. continuing | d. transverse |
Reply: A
In longitudinal waves, particles of the medium vibrate to and from in a direction parallel to the direction of energy ship. If energy is transmitted along a medium from the east end to the west end, so particles of the medium would vibrate east and westward
A sound wave is a longitudinal wave just not the answer since a wave which exhibits this characteristic is not necessarily a sound wave.
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3. When the particles of a medium are vibrating at right angles to the direction of energy transport, then the wave is a ____ wave.
| a. longitudinal | b. sound | c. continuing | d. transverse |
Answer: D
In transverse waves, particles of the medium vibrate to and from in a direction perpendicular to the direction of energy send.
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4. A transverse wave is traveling through a medium. See diagram beneath. The particles of the medium are vibrating _____ .
| a. parallel to the line joining AD. | b. forth the line joining CI. |
| c. perpendicular to the line joining Advert. | d. at various angles to the line CI. |
| e. along the curve CAEJGBI. |
Answer: A
In transverse waves, particles of the medium vibrate to and from in a management perpendicular to the direction of free energy transport. In this example, that would exist parallel to the line AD.
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five. If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating _____ .
| a. from north to south, only | b. both n and due south |
| c. from east to west, only | d. both east and westward |
Answer: B
In longitudinal waves, particles of the medium vibrate to and from in a management parallel to the direction of free energy send. If the particles only moved north and not back south, then the particles would be permanently displaced from their rest position; this is not wavelike.
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6. As a pulse travels though a uniform medium, the speed of the pulse ____.
| a. decreases | b. increases | c. remains the aforementioned |
Answer: C
The speed of a wave or a pulse depends upon the properties of the medium. If the medium is uniform or unchanging, and so the speed is abiding.
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seven. The primary factor which effects the speed of a sound wave is the ____.
| a. amplitude of the audio wave | b. intensity of the audio |
| c. loudness of the sound | d. properties of the medium |
| eastward. pitch of the sound |
Answer: D
The speed of a moving ridge is dependent upon the properties of the medium and not the properties of the moving ridge.
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8. Equally a moving ridge travels into a medium in which its speed increases, its wavelength would ____.
| a. decrease | b. increase | c. remain the same |
Respond: B
As a wave crosses a boundary into a new medium, its speed and wavelength change while its frequency remains the aforementioned. If the speed increases, and then the wavelength must increase every bit well in order to maintain the same frequency.
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9. As a wave passes across a boundary into a new medium, which feature of the moving ridge would Not alter?
| a. speed | b. frequency | c. wavelength |
Reply: B
Equally a moving ridge crosses a boundary into a new medium, its speed and wavelength alter while its frequency remains the same.
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ten. What is the amplitude of the wave in the diagram below?
| a. 0.03 1000. | b. 0.04 m. | c. 0.05 k. | d. 0.06 yard. |
Answer: A
The amplitude of a wave is measured from residuum to crest or from residual to trough; but non from crest to trough. Thus, take the 0.06 1000 measurement and "halve information technology" to get the answer.
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eleven. The wavelength of the wave in the diagram above (Question #ten) is ____ thousand.
| a. 0.030 | b. 0.040 | c. 0.060 | d. 0.080 |
Respond: D
The wavelength of a wave is measured as the distance between any ii corresponding points on adjacent waves, which would hateful from a crest to the next side by side crest. Thus, the distance from indicate b to point d is the wavelength - 0.08 m
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12. A wave 10 meters long passes through a medium with a speed of Y meters per second. The frequency of the wave could be expressed as
| a. Y/Ten cycles/sec. | b. X/Y cycles/sec. | c. XY cycles/sec. | d. (X + Y) cycles/sec. |
Answer: A
Let d = wavelength. Since d*f = v, f = v/d.
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Consider the following diagram for Questions #13-#14.
13. How many complete waves are shown in the diagram?
Answer: D
From betoken A to point Due east is 1 total moving ridge cycle. After point East, the moving ridge begins to repeat itself, just merely for one-half of a cycle. Thus, there are 1.5 waves shown in the diagram.
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14. If the distance from point A to point B in the diagram is sixty cm, and then the wavelength is ____.
| a. xx cm. | b. 40 cm. | c. threescore cm. | d. 90 cm. |
Answer: B
From point A to point East is one full wave bicycle. This distance represents two-thirds of the 60 cm from A to G. Thus, the wavelength is (2/3)*60 cm = 40 cm.
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15. The number of cycles of a periodic wave occurring per unit time is defined as a wave's ____.
| a. wavelength. | b. period. | c. amplitude. | d. frequency. |
Respond: D
This is a basic definition which you should know and exist able to apply.
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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 ii.00 Hz and the wave speed is 5.00m/s then the distance between side by side wave crests is ___ meter.
| a. 0.200 | b. 0.400 | c. 1.25 | d. 2.l | e. 10.0 |
Answer: D
Let due west=wavelength; then 5 = west*f. In this trouble, it is given that 5=5.00 1000/s and f = 2.00 Hz. Substitution and algebra yields due west = v / f = 2.l g.
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17. What is the frequency of a wave that has a speed of 0.iv one thousand/s and a wavelength of 0.020 meter?
| a. 10 hertz. | b. xx hertz. | c. 0.008 hertz. | d. 0.5 hertz. |
Reply: B
Let westward=wavelength; then five = due west*f. In this trouble, it is given that 5=5 m/southward and due west = .02 m. Exchange and algebra yields f=5/w=20 Hz.
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18. Many wave backdrop are dependent upon other wave properties. Yet, i wave property is independent of all other moving ridge properties. Which 1 of the following properties of a wave is contained of all the others?
| a. wavelength | b. frequency | c. flow | d. velocity |
Answer: D
The speed of a wave is dependent upon the backdrop of the medium through which information technology moves, not upon the properties of the wave itself.
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19. A pendulum makes exactly 40 vibrations in 20.0 s. Its period is ____. (Exist cautious of the units.)
| a. 0.500 Hz. | b. 0.500 s. | c. 2.00 Hz. | d. two.00 s. | e. viii.00 x ten2 Hz. |
Answer: B
The menstruum is the time for one consummate bicycle. If the pendulum takes 20 seconds for exactly 40 vibrational cycles, then information technology must take 0.500 second for one cycle.
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20. A menses of 0.005 seconds would be equivalent to a frequency of ____ Hz.
| a. 20 | b. 50 | c. 200 | d. 500 | due east. 2000 |
Reply: C
The flow and the frequency are related by a reciprocal relationship; that is, f = 1/T.
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21. TRUE or FALSE:
The number of waves generated per 2d by a source is called the frequency of the source.
Answer: A
This is a bones definition which y'all should know and be able to apply.
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22. True or FALSE:
The SI unit for frequency is hertz.
Reply: A
Know this like the back of your hand.
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23. TRUE or Fake:
Doubling the frequency of a moving ridge source (without altering the medium) doubles the speed of the waves.
Respond: B
Don't be fooled. Wave speed may equal frequency*wavelength. Nonetheless doubling the frequency only halves the wavelength; moving ridge speed remains the same. To change the wave speed, the medium would have to be changed.
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24. If the frequency of a wave is doubled and if the speed remains constant, its wavelength is ____.
| a. quartered. | b. halved. | c. unchanged. | d. doubled. |
Answer: B
Moving ridge speed equals frequency*wavelength. So doubling the frequency must halve the wavelength in order for wave speed to remain the same.
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Reply: C
The speeds in the ii media can be deduced by the altitude of the pulses from the purlieus. In A and E, the speed is shown as fastest on the correct, which makes the transmitted medium the less dumbo. Dominion out A and E since a reflected pulse should not invert when moving from more dense to less dens. Rule out B for just the opposite reasons; the moving ridge is moving from less to more dense and should invert upon reflection. Rule out D considering the transmitted pulse never inverts. That leaves C as the respond.
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26. When a pulse reaches a purlieus between 2 different media, it volition be____.
| a. reflected, but. | b. transmitted, merely. |
| c. partly reflected and partly transmitted. | d. neither reflected nor transmitted. |
Answer: C
This is basic information nearly the boundary beliefs of waves.
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Reply: E
A, B, and C can be speedily ruled out since it shows the amplitude of the reflected and incident pulse to be the same size. An incident pulse would give up some of its free energy to the transmitted pulse at the purlieus, thus making the amplitude of the reflected pulse less than that of the incident pulse. Rule out D since information technology shows the reflected pulse moving faster than the transmitted pulse. This would not happen unless moving from less dense to more than dumbo. This leaves E as the answer.
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28. A wave whose speed in a snakey is 4.4 k/s enters a second snakey. The wavelength changes from 2.0 m to three.0 m. The moving ridge in the second snakey travels at approximately ____.
| a. one.v chiliad/southward. | b. 2.2 k/s. | c. ii.9 m/southward. | d. 4.four thou/s. | eastward. 6.six thousand/southward. |
Answer: East
This is some other boundary behavior question with a mathematical camber to it. The frequency of the incident and transmitted waves are always the aforementioned. Thus, use f =v/w to find the frequency of the incident wave - 2.two Hz. The frequency of the transmitted wave is >also 2.2 Hz, the wavelength is 3.0 m, and and then the speed is f*w = half-dozen.half-dozen m/s.
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Answer: D
WOW! Tough one. Draw a second wave to the right of the moving ridge which is given. And so visually motility the moving ridge to the left. Visualize in your mind the shape of the resultant every bit interference occurs. It volition never expect similar D. If you yet don't go it, take a interruption and picket some TV.
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30. A 2.0-meter long rope is hanging vertically from the ceiling and fastened to a vibrator. A single pulse is observed to travel to the end of the rope in 0.l due south. What frequency should be used by the vibrator to maintain three whole waves in the rope?
| a. 0.75 Hz | b. 1.three Hz | c. 4.0 Hz | d. six.0 Hz | east. 8.0 Hz |
Answer: D
The given info allows you to make up one's mind the speed of the wave: 5=d/t=two k/0.five s) = 4 g/south. If at that place are iii waves in a two-meter long rope, then each moving ridge is 2/3-meter long. Now find frequency with the equation v=f*w where five=four m/s and due west=0.667 yard. Proper algebra yields half-dozen Hz as the answer.
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31. A standing moving ridge experiment is performed to decide the speed of waves in a rope. The standing moving ridge pattern shown below is established in the rope. The rope makes exactly xc complete vibrational cycles in ane minute. The speed of the waves is ____ g/southward.
| a. 3.0 | b. 6.0 | c. 180 | d. 360 | e. 540 |
Answer: B
If there are exactly 90 vibrations in lx.0 seconds, then there is a frequency of 1.v Hz. The diagram shows one.5 waves in six.0-meters of rope; thus, the wavelength is 4.0 meters. At present use the equation v=f*w to summate the speed of the wave. Proper exchange yields six.0 k/s.
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32. Consider the standing wave pattern shown below. A wave generated at the left stop of the medium undergoes reflection at the fixed end on the right side of the medium. The number of antinodes in the diagram is _____.
| a. 3 | b. v | c. 6 | d. seven | e. 12 |
Answer: C
An antinode is a point on the medium which oscillates from a large + to a big - displacement. Count the number of these points - there are 6 - but do non count them twice.
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33. A node is a point located forth the medium where there is always ___.
| a. a double crest | b. | c. constructive interference |
| d. destructive interference | e. a double rarefaction |
Answer: D
A node is a point along the medium of no displacement. The point is not displaced because subversive interference occurs at this betoken.
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34. True or Imitation:
Constructive interference of waves occurs when two crests meet.
Answer: A
Yes! Or when a trough meets a trough or whenever two waves displaced in the aforementioned direction (such as both up or both down) meet.
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35. Which phenomenon is produced when two or more than waves passing simultaneously through the aforementioned medium meet upward with one another?
| a. refraction | b. diffraction | c. interference | d. reflection |
Answer: C
Interference is the meeting of 2 or more than waves when passing forth the same medium - a basic definition which you should know and exist able to apply.
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36. Ii pulses are traveling in reverse directions along the same medium every bit shown in the diagram at the right. Which diagram below best depicts the advent of the medium when each pulse meets in the centre?
Respond: D
When a crest is completely overlapped with a trough having the same amplitude, subversive interference occurs. Consummate cancellation takes place if they have the same shape and are completely overlapped.
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37. True or Simulated:
A vibrating object is necessary for the production of sound.
Reply: A
Admittedly! If yous don't believe it, then retrieve of some sounds - voice, guitar, pianoforte, tuning fork, chalkboard screech, etc. - and consider what the vibrational source is. All sounds have a vibrating object of some kind equally their source.
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38. Which ane of the following CANNOT transmit sound?
| a. Liquid air | b. Gaseous oxygen | c. Liquid water |
| d. Solid steel | eastward. Perfect vacuum |
Answer: Due east
Sound is a mechanical moving ridge and equally such requires a medium in social club to move through space. For this reason, audio cannot move through a vacuum.
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