Wave Behavior Worksheet Answer Key
Basics of Waves Review
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1. A unmarried disturbance that moves from point to point through a medium is called a ___.
| a. period | b. periodic moving ridge | c. wavelength | d. pulse |
Answer: D
A moving ridge 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 send, then the wave 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 management parallel to the management of energy transport. If energy is transmitted forth a medium from the east finish to the westward cease, then particles of the medium would vibrate e and westward
A sound wave is a longitudinal wave simply 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 free energy transport, so the wave is a ____ wave.
| a. longitudinal | b. audio | c. continuing | 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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iv. A transverse wave is traveling through a medium. Run 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. |
| east. along the curve CAEJGBI. |
Answer: A
In transverse waves, particles of the medium vibrate to and from in a direction perpendicular to the management of energy transport. In this case, that would be parallel to the line Advert.
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5. If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating _____ .
| a. from northward to south, simply | b. both north and south |
| c. from east to west, only | d. both eastward and west |
Answer: B
In longitudinal waves, particles of the medium vibrate to and from in a management parallel to the direction of free energy transport. If the particles but moved n and not dorsum south, then the particles would be permanently displaced from their residuum position; this is not wavelike.
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6. Every bit 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 moving ridge or a pulse depends upon the properties of the medium. If the medium is uniform or unchanging, then the speed is constant.
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seven. The main factor which effects the speed of a sound moving ridge is the ____.
| a. amplitude of the sound moving ridge | b. intensity of the sound |
| c. loudness of the sound | d. backdrop of the medium |
| eastward. pitch of the sound |
Answer: D
The speed of a wave is dependent upon the properties of the medium and not the properties of the wave.
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eight. As 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 moving ridge crosses a boundary into a new medium, its speed and wavelength change while its frequency remains the same. If the speed increases, then the wavelength must increment equally well in guild to maintain the same frequency.
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9. As a wave passes across a purlieus into a new medium, which characteristic of the wave would NOT modify?
| a. speed | b. frequency | c. wavelength |
Respond: B
As a moving ridge crosses a boundary into a new medium, its speed and wavelength change while its frequency remains the aforementioned.
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10. What is the amplitude of the wave in the diagram below?
| a. 0.03 m. | b. 0.04 m. | c. 0.05 1000. | d. 0.06 m. |
Respond: A
The amplitude of a wave is measured from rest to crest or from rest to trough; merely not from crest to trough. Thus, take the 0.06 m measurement and "halve it" to go the reply.
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xi. The wavelength of the wave in the diagram above (Question #10) is ____ m.
| 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 two corresponding points on adjacent waves, which would hateful from a crest to the next next crest. Thus, the distance from point b to point d is the wavelength - 0.08 m
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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 moving ridge could be expressed as
| a. Y/X cycles/sec. | b. X/Y cycles/sec. | c. XY cycles/sec. | d. (X + Y) cycles/sec. |
Reply: 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?
Respond: D
From point A to point East is ane full wave cycle. Subsequently indicate E, the wave begins to repeat itself, but simply for one-half of a bicycle. Thus, in that location are 1.5 waves shown in the diagram.
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xiv. If the distance from indicate A to indicate B in the diagram is 60 cm, then the wavelength is ____.
| a. xx cm. | b. 40 cm. | c. 60 cm. | d. ninety cm. |
Answer: B
From betoken A to signal E is one full moving ridge cycle. This distance represents ii-thirds of the 60 cm from A to M. Thus, the wavelength is (2/3)*60 cm = xl cm.
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15. The number of cycles of a periodic moving ridge occurring per unit time is divers as a wave's ____.
| a. wavelength. | b. period. | c. aamplitude. | d. frequency. |
Answer: D
This is a bones definition which you should know and be able to employ.
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xvi. A periodic and repeating disturbance in a lake creates waves which emanate outward from its source to produce round 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. one.25 | d. 2.fifty | e. ten.0 |
Reply: D
Let west=wavelength; and so v = w*f. In this problem, it is given that 5=5.00 1000/due south and f = 2.00 Hz. Substitution and algebra yields west = v / f = 2.50 thousand.
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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
Let w=wavelength; then v = due west*f. In this problem, it is given that v=5 m/s and westward = .02 chiliad. Substitution and algebra yields f=v/west=20 Hz.
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18. Many wave backdrop are dependent upon other wave properties. Yet, one wave holding is independent of all other wave properties. Which one of the following backdrop of a wave is independent of all the others?
| a. wavelength | b. frequency | c. period | d. velocity |
Answer: D
The speed of a wave is dependent upon the properties of the medium through which it moves, not upon the backdrop of the moving ridge 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 southward. | c. 2.00 Hz. | d. ii.00 s. | e. 8.00 10 102 Hz. |
Answer: B
The catamenia is the time for one complete cycle. If the pendulum takes twenty seconds for exactly 40 vibrational cycles, then it must have 0.500 2nd for one wheel.
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20. A period of 0.005 seconds would be equivalent to a frequency of ____ Hz.
| a. 20 | b. 50 | c. 200 | d. 500 | due east. 2000 |
Answer: C
The catamenia and the frequency are related by a reciprocal relationship; that is, f = ane/T.
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21. True or Fake:
The number of waves generated per second by a source is called the frequency of the source.
Answer: A
This is a basic definition which yous should know and exist able to use.
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22. Truthful or FALSE:
The SI unit of measurement for frequency is hertz.
Respond: A
Know this like the dorsum of your hand.
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23. TRUE or Imitation:
Doubling the frequency of a moving ridge source (without altering the medium) doubles the speed of the waves.
Respond: B
Don't exist fooled. Wave speed may equal frequency*wavelength. Nonetheless doubling the frequency just halves the wavelength; wave speed remains the same. To modify the wave speed, the medium would take to be changed.
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24. If the frequency of a moving ridge 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 guild for wave speed to remain the same.
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Reply: C
The speeds in the two media can be deduced by the distance 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 dense. Rule out A and Eastward since a reflected pulse should not invert when moving from more dense to less dens. Rule out B for just the contrary reasons; the moving ridge is moving from less to more 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 betwixt 2 unlike media, it will be____.
| a. reflected, only. | b. transmitted, just. |
| c. partly reflected and partly transmitted. | d. neither reflected nor transmitted. |
Answer: C
This is basic information about the boundary behavior of waves.
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Answer: Eastward
A, B, and C can be quickly 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 energy to the transmitted pulse at the boundary, thus making the amplitude of the reflected pulse less than that of the incident pulse. Rule out D since it shows the reflected pulse moving faster than the transmitted pulse. This would not happen unless moving from less dense to more dense. This leaves Eastward equally the answer.
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28. A wave whose speed in a snakey is four.4 m/southward 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. 1.5 m/s. | b. 2.2 m/s. | c. ii.9 1000/south. | d. 4.4 m/s. | due east. half dozen.6 m/s. |
Reply: Due east
This is another purlieus behavior question with a mathematical slant to information technology. The frequency of the incident and transmitted waves are ever the same. Thus, apply f =5/due west to find the frequency of the incident moving ridge - 2.ii Hz. The frequency of the transmitted wave is >besides 2.two Hz, the wavelength is 3.0 yard, and and so the speed is f*w = 6.6 k/s.
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Respond: D
WOW! Tough 1. Draw a 2d wave to the right of the moving ridge which is given. So visually move the moving ridge to the left. Visualize in your mind the shape of the resultant as interference occurs. It will never await like D. If you yet don't go it, accept a pause and watch some Television.
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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.l s. What frequency should be used by the vibrator to maintain three whole waves in the rope?
| a. 0.75 Hz | b. 1.iii Hz | c. iv.0 Hz | d. 6.0 Hz | east. eight.0 Hz |
Answer: D
The given info allows you to determine the speed of the wave: v=d/t=2 m/0.5 southward) = iv k/s. If there are 3 waves in a 2-meter long rope, then each wave is two/3-meter long. Now find frequency with the equation v=f*w where v=iv yard/due south and w=0.667 one thousand. Proper algebra yields half-dozen Hz as the answer.
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31. A standing wave experiment is performed to decide the speed of waves in a rope. The continuing moving ridge pattern shown below is established in the rope. The rope makes exactly 90 consummate vibrational cycles in one infinitesimal. The speed of the waves is ____ m/due south.
| a. iii.0 | b. 6.0 | c. 180 | d. 360 | due east. 540 |
Answer: B
If there are exactly 90 vibrations in 60.0 seconds, then there is a frequency of one.5 Hz. The diagram shows 1.5 waves in 6.0-meters of rope; thus, the wavelength is four.0 meters. At present use the equation 5=f*w to calculate the speed of the wave. Proper exchange yields 6.0 g/south.
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32. Consider the standing wave pattern shown below. A moving ridge 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. three | b. 5 | c. 6 | d. 7 | eastward. 12 |
Answer: C
An antinode is a point on the medium which oscillates from a big + to a large - displacement. Count the number of these points - there are 6 - merely practise not count them twice.
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33. A node is a betoken located along the medium where there is e'er ___.
| a. a double crest | b. | c. effective interference |
| d. destructive interference | east. a double rarefaction |
Answer: D
A node is a point forth the medium of no displacement. The point is non displaced because subversive interference occurs at this point.
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34. True or FALSE:
Effective interference of waves occurs when 2 crests meet.
Respond: A
Yes! Or when a trough meets a trough or whenever two waves displaced in the same direction (such as both up or both downwards) see.
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35. Which phenomenon is produced when ii or more waves passing simultaneously through the same medium see up with 1 some other?
| a. refraction | b. diffraction | c. interference | d. reflection |
Answer: C
Interference is the meeting of two or more than waves when passing along the aforementioned medium - a basic definition which y'all should know and be able to utilize.
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36. Two pulses are traveling in contrary 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?
Answer: D
When a crest is completely overlapped with a trough having the same amplitude, subversive interference occurs. Complete counterfoil takes identify if they have the same shape and are completely overlapped.
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37. TRUE or FALSE:
A vibrating object is necessary for the production of sound.
Answer: A
Admittedly! If you don't believe it, so remember of some sounds - voice, guitar, piano, tuning fork, chalkboard screech, etc. - and consider what the vibrational source is. All sounds take a vibrating object of some kind as their source.
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38. Which i of the following CANNOT transmit audio?
| a. Liquid air | b. Gaseous oxygen | c. Liquid water |
| d. Solid steel | due east. Perfect vacuum |
Respond: East
Sound is a mechanical moving ridge and as such requires a medium in order to move through space. For this reason, sound cannot move through a vacuum.
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Wave Behavior Worksheet Answer Key,
Source: https://www.physicsclassroom.com/reviews/Waves/Waves-Review-Answers
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