14 Study Guide Wave Behavior Answer
1. A single disturbance that moves from point to point through a medium is called a. 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. Useful Web Links 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. Longitudinal b. Transverse Answer: A In longitudinal waves, particles of the medium vibrate to and from in a direction parallel to the direction of energy transport.
If energy is transmitted along a medium from the east end to the west end, then particles of the medium would vibrate eastward and westward A sound wave is a longitudinal wave but not the answer since a wave which exhibits this characteristic is not necessarily a sound wave. Useful Web Links 3.
When the particles of a medium are vibrating at right angles to the direction of energy transport, then the wave is a wave. Longitudinal b. Transverse Answer: D In transverse waves, particles of the medium vibrate to and from in a direction perpendicular to the direction of energy transport. Useful Web Links 4. A transverse wave is traveling through a medium. See diagram below. The particles of the medium are vibrating.
Waves Wave Behaviors Answers
Parallel to the line joining AD. Along the line joining CI.
Perpendicular to the line joining AD. At various angles to the line CI. 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. Useful Web Links 5.
If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating. From north to south, only b.
Both north and south c. From east to west, only d. Both east and west Answer: 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 north and not back south, then the particles would be permanently displaced from their rest position; this is not wavelike. Useful Web Links 6. As a pulse travels though a uniform medium, the speed of the pulse. Remains the same Answer: C The speed of a wave or a pulse depends upon the properties of the medium.
If the medium is uniform or unchanging, then the speed is constant. Useful Web Links 7. The main factor which effects the speed of a sound wave is the. Amplitude of the sound wave b. Intensity of the sound c. Loudness of the sound d. Properties of the medium e.
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. Useful Web Links 8. As a wave travels into a medium in which its speed increases, its wavelength would. Remain the same Answer: 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, then the wavelength must increase as well in order to maintain the same frequency.
Useful Web Links 9. As a wave passes across a boundary into a new medium, which characteristic of the wave would NOT change? Wavelength Answer: B As a wave crosses a boundary into a new medium, its speed and wavelength change while its frequency remains the same.
Useful Web Links 10. What is the amplitude of the wave in the diagram below?
Answer: A The amplitude of a wave is measured from rest to crest or from rest to trough; but not from crest to trough. Thus, take the 0.06 m measurement and 'halve it' to get the answer. Useful Web Links 11. The wavelength of the wave in the diagram above (Question #10) is m. 0.080 Answer: D The wavelength of a wave is measured as the distance between any two corresponding points on adjacent waves, which would mean from a crest to the next adjacent crest. Thus, the distance from point b to point d is the wavelength - 0.08 m Useful Web Links 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 a. Y/X cycles/sec. X/Y cycles/sec. XY cycles/sec. (X + Y) cycles/sec. Answer: A Let d = wavelength.
14 Study Guide Waves Behavior Answers
Since d.f = v, f = v/d. Useful Web Links Consider the following diagram for Questions #13-#14. How many complete waves are shown in the diagram? 1.5 Answer: D From point A to point E is one full wave cycle. After point E, the wave begins to repeat itself, but only for one-half of a cycle. Thus, there are 1.5 waves shown in the diagram. 14.
If the distance from point A to point B in the diagram is 60 cm, then the wavelength is. Ford courier 4x4 service manual 2015. Answer: B From point A to point E is one full wave cycle. This distance represents two-thirds of the 60 cm from A to G. Thus, the wavelength is (2/3).60 cm = 40 cm.
Useful Web Links 15. The number of cycles of a periodic wave occurring per unit time is defined as a wave's. Answer: D This is a basic definition which you should know and be able to apply.
Useful Web Links 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. 10.0 Answer: D Let w=wavelength; then v = w.f. In this problem, it is given that v=5.00 m/s and f = 2.00 Hz. Substitution and algebra yields w = v / f = 2.50 m. Useful Web Links 17.
What is the frequency of a wave that has a speed of 0.4 m/s and a wavelength of 0.020 meter? Answer: B Let w=wavelength; then v = w.f. In this problem, it is given that v=5 m/s and w =.02 m.
Substitution and algebra yields f=v/w=20 Hz. Useful Web Links 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? Wavelength b.
Velocity Answer: D The speed of a wave is dependent upon the properties of the medium through which it moves, not upon the properties of the wave itself. Useful Web Links 19. A pendulum makes exactly 40 vibrations in 20.0 s. Its period is. (Be cautious of the units.) a. 8.00 x 10 2 Hz. Answer: B The period is the time for one complete cycle.
If the pendulum takes 20 seconds for exactly 40 vibrational cycles, then it must take 0.500 second for one cycle. Useful Web Links 20. A period of 0.005 seconds would be equivalent to a frequency of Hz. 2000 Answer: C The period and the frequency are related by a reciprocal relationship; that is, f = 1/T. Useful Web Links 21. TRUE or FALSE: The number of waves generated per second by a source is called the frequency of the source. False Answer: A This is a basic definition which you should know and be able to apply.
Useful Web Links 22. TRUE or FALSE: The SI unit for frequency is hertz. False Answer: A Know this like the back of your hand. Useful Web Links 23. TRUE or FALSE: Doubling the frequency of a wave source (without altering the medium) doubles the speed of the waves.
False Answer: B Don't be fooled. Wave speed may equal frequency.wavelength. Yet doubling the frequency only halves the wavelength; wave speed remains the same. To change the wave speed, the medium would have to be changed. Useful Web Links 24. If the frequency of a wave is doubled and if the speed remains constant, its wavelength is. Answer: B Wave speed equals frequency.wavelength.
So doubling the frequency must halve the wavelength in order for wave speed to remain the same. Useful Web Links 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?
Answer: C The speeds in the two media can be deduced by the distance of the pulses from the boundary. 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 dense and should invert upon reflection. Rule out D because the transmitted pulse never inverts. That leaves C as the answer. Useful Web Links 26.
When a pulse reaches a boundary between two different media, it will be. Reflected, only.
Transmitted, only. Partly reflected and partly transmitted. Neither reflected nor transmitted. Answer: C This is basic information about the boundary behavior of waves. Useful Web Links 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). Answer: E 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 E as the answer. Useful Web Links 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. Answer: E This is another boundary 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 find the frequency of the incident wave - 2.2 Hz. The frequency of the transmitted wave is also 2.2 Hz, the wavelength is 3.0 m, and so the speed is f.w = 6.6 m/s.
Useful Web Links 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? Answer: D WOW! Draw a second wave to the right of the wave 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 look like D. If you still don't get it, take a break and watch some TV. Useful Web Links 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?
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, then each wave is 2/3-meter long. Now find frequency with the equation v=f.w where v=4 m/s and w=0.667 m. Proper algebra yields 6 Hz as the answer. Useful Web Links 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. 540 Answer: B If there are exactly 90 vibrations in 60.0 seconds, then there is a frequency of 1.5 Hz. The diagram shows 1.5 waves in 6.0-meters of rope; thus, the wavelength is 4.0 meters. Now use the equation v=f.w to calculate the speed of the wave.
Proper substitution yields 6.0 m/s. Useful Web Links 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. 12 Answer: C An antinode is a point on the medium which oscillates from a large + to a large - displacement.
Count the number of these points - there are 6 - but do not count them twice. Useful Web Links 33. A node is a point located along the medium where there is always. A double crest b. 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 destructive interference occurs at this point. Useful Web Links 34. TRUE or FALSE: Constructive interference of waves occurs when two crests meet. False Answer: A Yes! Or when a trough meets a trough or whenever two waves displaced in the same direction (such as both up or both down) meet. Useful Web Links 35.
Which phenomenon is produced when two or more waves passing simultaneously through the same medium meet up with one another? Refraction b. Diffraction c. Interference d. Reflection Answer: C Interference is the meeting of two or more waves when passing along the same medium - a basic definition which you should know and be able to apply. Useful Web Links 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? Answer: 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. Useful Web Links 37.
TRUE or FALSE: A vibrating object is necessary for the production of sound. False Answer: A Absolutely!
If you don't believe it, then think of some sounds - voice, guitar, piano, tuning fork, chalkboard screech, etc. and consider what the vibrational source is. All sounds have a vibrating object of some kind as their source. Useful Web Links 38. Which one of the following CANNOT transmit sound?
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, sound cannot move through a vacuum.
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It's a perfect resource for those wishing to improve their problem-solving skills. Visit:. Minds On Physics the App Series Minds On Physics the App ('MOP the App') is a series of interactive questioning modules for the student that is serious about improving their conceptual understanding of physics. Each module of the series covers a different topic and is further broken down into sub-topics. A 'MOP experience' will provide a learner with challenging questions, feedback, and question-specific help in the context of a game-like environment. It is available for phones, tablets, Chromebooks, and Macintosh computers.
It's a perfect resource for those wishing to refine their conceptual reasoning abilities. Part 5 of the series includes topics on Wave Motion.