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Mechanical Waves and Sound

D. Hobson

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Across
5.high frequencies produce ____ pitches
7.What is the wavelength of a wave with a frequency of 2.5 Hz and a speed of 25 m/s? (2 Words)
9.part of the ear that gathers and focuses sound (2 Words)
13.a point on a standing wave that has no displacement from the rest position
14.a change in a sound frequency caused by motion of the sound source, motion of the listener, or both (2 Words)
17.the bending of a wave as it enters a new medium at an angle
18.a wave will diffract more if its _____ is large compared to the size of an opening or obstacle
19.increasing the frequency of a wave _____ its wavelength
21.number of complete cycles in a given time
23.plural of medium
26.What is the speed of a wave with a wavelength of 10.0 m and a frequency of 3 Hz? (4 Words)
29.the threshold level for lengthy exposure to sound is ____ decibels
30.a unit for wavelength
32.types of sound waves that are above the frequencies that people can hear
34.the frequency of a sound as a person perceives it
35.this occurs when a wave bounces off a surface that it cannot pass through
36.sound travels fastest in _____ due to the fact that particles tend to be closer together
37.a wave that appears to stay in one place (2 Words)
44.what would be the size of the new amplitude if the following two waves combine with constructive interference: one wave has a crest of two meters and trough of negative two meters, the other wave has a crest of two meters with a trough of negative two meters? (2 Words)
46.mechanical waves are classified by the way they ____ through a medium
47.this occurs when two or more waves overlap and combine together
48.type of wave that travels along a surface between two media (2 Words)
51.sound intensity is _______ proportional to the wave's amplitude
52.the maximum displacement of the medium from its rest position
57.a material through which a wave travels
58.type of wave produced by earthquakes (2 Words)
59.motion that repeats at regular intervals (2 Words)
60.the amplitude of a wave is directly proportional to its _____
Down
1.direction an object moves in the middle of the ocean
2.the time required for a wave to complete one cycle
3.a unit for speed (3 Words)
4.unit of frequency
6.part of the ear that uses nerve endings to sense vibrations and send signals to the brain (2 Words)
8.refraction of a wave can occur because one side of the wave moves more _____ than the other side
10.What is the frequency of a wave traveling at 100 m/s with a wavelength of 5 m? (2 Words)
11.a person's subjective interpretation to the intensity of a sound
12.a reflection can cause a wave to be ________ (3 Words)
15.sounds travels at _____ m/s in aluminum at 25 degrees Celsius (2 Words)
16.type of wave that causes the medium to vibrate at right angles to the direction in which the wave travels
20.an area where the particles in a medium are spaced close together
22.occurs when two or more waves combine to produce a wave with a larger displacement (2 Words)
24.position of every point in a wave before a wave starts to vibrate (2 Words)
25.distance between a point on one wave and the same point on the next cycle of the wave
27.a disturbance in matter that carries energy from one place to another (2 Words)
28.part of the ear which receives and amplifies the vibrations (2 Words)
31.what would be the size of the new amplitude if the following two waves combine with destructive interference: one wave has a crest of five meters and trough of negative five meters, the other wave has a crest of two meters with a trough of negative two meters? (2 Words)
33.type of wave in which the vibration of the medium is parallel to the direction the wave travels
38.a wave's frequency equals the frequency of the vibrating _____ producing the wave
39.sound intensity is _______ proportional to the distance from the sound source
40.the rate at which a wave's energy flows through a given area
41.a repeating back-and-forth motion
42.the lowest point of the wave below the rest position
43.an area where the particles in a medium are spread out
45.the bending of a wave as it moves around an obstacle or passes through a narrow opening
49.destructive interference produces waves with ______ displacements
50.the unit for sound intensity
53.the speed of a wave is the ______ of its wavelength and frequency
54.a person will hear a ______ frequency than the sound source when the source is moving away because the wave fronts are spread out
55.the highest point of the wave above the rest position
56.sound travels _____ in cold, dry air than warm, dry air

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