Skills Worksheet Concept Review Section Characteristics of Waves
Basics of Waves Review
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ane. A unmarried disturbance that moves from point to point through a medium is called a ___.
| a. period | 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 aforementioned direction of energy transport, and so the moving ridge is a ____ moving ridge.
| a. longitudinal | b. sound | c. continuing | d. transverse |
Respond: A
In longitudinal waves, particles of the medium vibrate to and from in a direction parallel to the direction of energy send. If free energy is transmitted forth a medium from the eastward end to the westward end, then particles of the medium would vibrate eastward and w
A sound wave is a longitudinal wave only not the respond since a moving ridge 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, and then the wave is a ____ moving ridge.
| a. longitudinal | b. sound | c. standing | d. transverse |
Answer: D
In transverse waves, particles of the medium vibrate to and from in a direction perpendicular to the management of energy transport.
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4. A transverse wave is traveling through a medium. Come across diagram below. The particles of the medium are vibrating _____ .
| a. parallel to the line joining AD. | b. along the line joining CI. |
| c. perpendicular to the line joining AD. | 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 direction perpendicular to the direction of energy transport. In this case, that would be 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 due north to s, but | b. both northward and southward |
| c. from east to west, only | d. both east and west |
Respond: B
In longitudinal waves, particles of the medium vibrate to and from in a direction parallel to the direction of energy transport. If the particles only moved due north and not dorsum south, then the particles would exist permanently displaced from their remainder position; this is not wavelike.
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half-dozen. Every bit a pulse travels though a uniform medium, the speed of the pulse ____.
| a. decreases | b. increases | c. remains the same |
Reply: C
The speed of a wave or a pulse depends upon the properties of the medium. If the medium is compatible or unchanging, then the speed is constant.
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7. The main cistron which effects the speed of a sound moving ridge is the ____.
| a. amplitude of the audio wave | b. intensity of the audio |
| c. loudness of the sound | d. properties of the medium |
| due east. pitch of the sound |
Answer: D
The speed of a moving ridge is dependent upon the properties of the medium and non the properties of the wave.
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8. As a wave travels into a medium in which its speed increases, its wavelength would ____.
| a. decrease | b. increase | c. remain the aforementioned |
Respond: B
As a wave crosses a boundary into a new medium, its speed and wavelength change while its frequency remains the same. If the speed increases, so the wavelength must increase likewise in social club to maintain the same frequency.
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nine. As a moving ridge passes across a boundary into a new medium, which feature of the wave would Non change?
| a. speed | b. frequency | c. wavelength |
Reply: B
As a moving ridge crosses a purlieus into a new medium, its speed and wavelength modify while its frequency remains the same.
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x. What is the amplitude of the wave in the diagram below?
| a. 0.03 k. | b. 0.04 thousand. | c. 0.05 m. | d. 0.06 m. |
Reply: A
The amplitude of a wave is measured from rest to crest or from remainder to trough; but non from crest to trough. Thus, take the 0.06 m measurement and "halve it" to get the respond.
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11. The wavelength of the moving ridge in the diagram higher up (Question #10) is ____ 1000.
| a. 0.030 | b. 0.040 | c. 0.060 | d. 0.080 |
Answer: D
The wavelength of a wave is measured as the distance between any ii respective points on side by side waves, which would mean from a crest to the adjacent adjacent crest. Thus, the altitude from bespeak b to betoken d is the wavelength - 0.08 g
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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 every bit
| a. Y/X cycles/sec. | b. X/Y cycles/sec. | c. XY cycles/sec. | d. (X + Y) cycles/sec. |
Respond: A
Let d = wavelength. Since d*f = v, f = v/d.
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Consider the following diagram for Questions #13-#14.
xiii. How many complete waves are shown in the diagram?
Reply: D
From signal A to point E is 1 full wave cycle. After point E, the moving ridge begins to repeat itself, but only for one-half of a cycle. Thus, there are one.5 waves shown in the diagram.
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14. If the distance from indicate A to point B in the diagram is lx cm, and then the wavelength is ____.
| a. twenty cm. | b. forty cm. | c. 60 cm. | d. 90 cm. |
Answer: B
From betoken A to bespeak E is one full wave cycle. This distance represents two-thirds of the 60 cm from A to Thousand. Thus, the wavelength is (2/3)*sixty cm = xl cm.
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15. The number of cycles of a periodic moving ridge occurring per unit time is defined as a wave's ____.
| a. wavelength. | b. period. | c. amplitude. | d. frequency. |
Answer: D
This is a basic definition which you should know and exist able to utilise.
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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 2.00 Hz and the wave speed is five.00m/s so the distance betwixt adjacent wave crests is ___ meter.
| a. 0.200 | b. 0.400 | c. one.25 | d. 2.50 | e. x.0 |
Reply: D
Let w=wavelength; then v = w*f. In this trouble, it is given that v=5.00 m/s and f = two.00 Hz. Substitution and algebra yields w = five / f = 2.50 k.
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17. What is the frequency of a wave that has a speed of 0.4 m/s and a wavelength of 0.020 meter?
| a. 10 hertz. | b. 20 hertz. | c. 0.008 hertz. | d. 0.5 hertz. |
Answer: B
Permit westward=wavelength; then v = w*f. In this problem, information technology is given that v=5 m/s and w = .02 yard. Exchange and algebra yields f=v/due west=twenty Hz.
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18. Many wave properties are dependent upon other wave properties. Notwithstanding, one wave belongings is independent of all other wave properties. Which 1 of the following backdrop of a wave is contained of all the others?
| a. wavelength | b. frequency | c. menstruation | d. velocity |
Answer: D
The speed of a wave is dependent upon the properties of the medium through which information technology moves, not upon the properties of the wave itself.
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xix. A pendulum makes exactly 40 vibrations in 20.0 due south. Its catamenia is ____. (Be cautious of the units.)
| a. 0.500 Hz. | b. 0.500 s. | c. ii.00 Hz. | d. 2.00 s. | e. eight.00 x 10two Hz. |
Respond: B
The menses is the fourth dimension for one complete wheel. If the pendulum takes 20 seconds for exactly twoscore vibrational cycles, and so information technology must have 0.500 second for one cycle.
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xx. A menstruation of 0.005 seconds would be equivalent to a frequency of ____ Hz.
| a. twenty | b. 50 | c. 200 | d. 500 | e. 2000 |
Answer: C
The menstruum and the frequency are related by a reciprocal relationship; that is, f = i/T.
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21. Truthful or Fake:
The number of waves generated per 2nd by a source is called the frequency of the source.
Answer: A
This is a basic definition which yous should know and be able to apply.
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22. Truthful or FALSE:
The SI unit of measurement for frequency is hertz.
Answer: A
Know this like the dorsum of your hand.
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23. True or FALSE:
Doubling the frequency of a wave source (without altering the medium) doubles the speed of the waves.
Respond: B
Don't be fooled. Wave speed may equal frequency*wavelength. Yet doubling the frequency just halves the wavelength; moving ridge speed remains the same. To change the wave speed, the medium would accept to exist 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. |
Respond: B
Wave speed equals frequency*wavelength. And so doubling the frequency must halve the wavelength in club for wave speed to remain the same.
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Respond: C
The speeds in the ii media can exist deduced by the altitude of the pulses from the purlieus. In A and E, the speed is shown as fastest on the right, which makes the transmitted medium the less dense. Rule 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 wave is moving from less to more than dense and should capsize upon reflection. Rule out D because the transmitted pulse never inverts. That leaves C as the answer.
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26. When a pulse reaches a boundary between ii different media, information technology will be____.
| a. reflected, only. | b. transmitted, only. |
| c. partly reflected and partly transmitted. | d. neither reflected nor transmitted. |
Answer: C
This is basic information almost the purlieus behavior of waves.
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Answer: Due east
A, B, and C can be quickly ruled out since it shows the amplitude of the reflected and incident pulse to be the aforementioned size. An incident pulse would requite up some of its energy to the transmitted pulse at the boundary, thus making the amplitude of the reflected pulse less than that of the incident pulse. Dominion out D since information technology shows the reflected pulse moving faster than the transmitted pulse. This would not happen unless moving from less dumbo to more dense. This leaves E as the answer.
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28. A moving ridge whose speed in a snakey is 4.4 m/s enters a second snakey. The wavelength changes from two.0 m to 3.0 m. The wave in the 2d snakey travels at approximately ____.
| a. i.five m/s. | b. two.2 thousand/s. | c. two.9 m/due south. | d. 4.four m/s. | e. 6.6 chiliad/southward. |
Answer: E
This is some other purlieus behavior question with a mathematical slant to it. The frequency of the incident and transmitted waves are always the same. Thus, use f =v/w to discover the frequency of the incident wave - 2.2 Hz. The frequency of the transmitted moving ridge is >too 2.ii Hz, the wavelength is three.0 k, and so the speed is f*westward = 6.half dozen thou/s.
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Answer: D
WOW! Tough i. Describe a 2nd moving ridge to the right of the moving ridge which is given. Then visually move the wave to the left. Visualize in your mind the shape of the resultant as interference occurs. It will never await like D. If you still don't go it, accept a suspension and watch some Goggle box.
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30. A two.0-meter long rope is hanging vertically from the ceiling and attached to a vibrator. A single pulse is observed to travel to the cease of the rope in 0.50 s. What frequency should be used by the vibrator to maintain 3 whole waves in the rope?
| a. 0.75 Hz | b. i.three Hz | c. 4.0 Hz | d. six.0 Hz | e. 8.0 Hz |
Answer: D
The given info allows you to determine the speed of the wave: v=d/t=2 m/0.5 s) = 4 m/s. If there are 3 waves in a 2-meter long rope, so each wave is ii/3-meter long. Now find frequency with the equation v=f*w where v=4 m/due south and west=0.667 m. Proper algebra yields 6 Hz every bit 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 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.
| a. 3.0 | b. vi.0 | c. 180 | d. 360 | due east. 540 |
Answer: B
If there are exactly ninety vibrations in threescore.0 seconds, then in that location is a frequency of one.5 Hz. The diagram shows 1.5 waves in 6.0-meters of rope; thus, the wavelength is 4.0 meters. At present use the equation 5=f*west to calculate the speed of the wave. Proper substitution yields half dozen.0 chiliad/due south.
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32. Consider the standing wave pattern shown below. A wave generated at the left end of the medium undergoes reflection at the fixed terminate on the right side of the medium. The number of antinodes in the diagram is _____.
| a. 3 | b. five | c. 6 | d. 7 | east. 12 |
Reply: C
An antinode is a point on the medium which oscillates from a big + to a large - displacement. Count the number of these points - in that location are half-dozen - but do non count them twice.
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33. A node is a indicate located along the medium where there is e'er ___.
| a. a double crest | b. | c. effective interference |
| d. destructive interference | e. a double rarefaction |
Answer: D
A node is a point forth the medium of no displacement. The point is not displaced because destructive interference occurs at this betoken.
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34. TRUE or Fake:
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 same direction (such equally both up or both down) meet.
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35. Which phenomenon is produced when two or more waves passing simultaneously through the aforementioned medium run across up with 1 another?
| a. refraction | b. diffraction | c. interference | d. reflection |
Answer: C
Interference is the coming together of two or more waves when passing along the same medium - a basic definition which you should know and be able to apply.
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36. Two pulses are traveling in opposite directions along the same medium as shown in the diagram at the right. Which diagram beneath best depicts the appearance of the medium when each pulse meets in the middle?
Reply: D
When a crest is completely overlapped with a trough having the same amplitude, destructive interference occurs. Complete 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.
Answer: A
Admittedly! If you don't believe information technology, so call back 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 as their source.
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38. Which one of the following CANNOT transmit audio?
| a. Liquid air | b. Gaseous oxygen | c. Liquid water |
| d. Solid steel | e. Perfect vacuum |
Answer: E
Sound is a mechanical wave and as such requires a medium in order to move through space. For this reason, audio cannot move through a vacuum.
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