6th Grade TEST - Chapter20 ONLINE REVIEW

6th Grade TEST - Chapter20 ONLINE REVIEW

True/False
Indicate whether the statement is true or false.

____ 1. Water waves can move a piece of cork floating on top of the water only in an up and down motion.

____ 2. Mechanical waves can travel in any type of medium.

____ 3. Radio waves are the only type of electromagnetic wave that is a transverse wave.

____ 4. Sound waves are compressional waves.

____ 5. The amplitude of a wave is the distance between a point on one wave and the identical point on the next wave.

____ 6. In general, the more energy a wave has the greater its amplitude.

____ 7. The speed of light depends on the medium it travels through.

____ 8. You can see yourself in a mirror because of the wave property called interference.

____ 9. Refraction occurs when the amplitude of a wave changes as it goes from one medium to another.

____ 10. You can hear sounds around the corner of a door due to the wave property called diffraction.

____ 11. High-pitched sounds have high frequencies, and low-pitched sounds wave low frequencies.

____ 12. Amplitude and frequency may vary in waves, but all waves travel at the same speed.

____ 13. Waves travel in straight lines and therefore cannot bend as they pass through a narrow opening.

____ 14. Mechanical waves transmit matter, while electromagnetic waves transmit energy.

____ 15. When you watch lightning, the light reaches you before the sound of the accompanying thunder because light travels faster than sound.

____ 16. Diffraction causes diamonds and other gems to sparkle.

____ 17. In a mechanical compressional wave, the wave energy causes the matter in the medium to move up and down or back and forth at right angles to the direction the wave travels.

____ 18. A group of molecules that are squeezed together is called a compression.

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____ 19. What is the best description of a wave?
a.
A wave transfers matter from one place to another.
b.
A wave transfers energy from one place to another.
c.
A wave transfers both energy and matter.
d.
A wave moves matter from one place to another.


____ 20. What kind of wave is created when an up and down motion of a rope produces right angles?
a.
compressional wave
b.
sound wave
c.
tranverse wave
d.
electromagnetic wave


____ 21. What kinds of waves do satellites use to transmit their locations to global positioning systems?
a.
electromagnetic radio waves
b.
infrared waves
c.
ultraviolet waves
d.
visible light waves


____ 22. What is the scientific term used to describe the amount of energy transferred by a wave?
a.
amplitude
b.
compression
c.
frequency
d.
vibration


____ 23. The school band is practicing their scales. As the pitch and frequency of the notes increases, what happens to the wavelength of the notes?
a.
The wavelength increases.
b.
The wavelength decreases then increases.
c.
The wavelength stays the same.
d.
The wavelength decreases.


____ 24. From the information on the chart, what can you conclude about the way sound travels?
a.
Sound waves travel faster as the temperature decreases.
b.
Sound waves travel more slowly through air.
c.
Sound waves travel faster as the temperature increases.
d.
Sound waves travel at a constant speed in all temperatures.


____ 25.
What kind of sound is an echo?
a.
diffraction
b.
reflection
c.
refraction
d.
vibration


____ 26. When the band is practicing in the music room, you can hear the music as it passes through the hallway. What property of sound does this example describe?
a.
amplification
b.
diffraction
c.
refraction
d.
vibration


____ 27. What happens when two waves meet?
a.
They collide and change direction.
b.
They collide and continue moving.
c.
They pass through each other and continue moving.
d.
They crash together and form a tsunami.


____ 28. When two waves overlap, they combine to form a new wave. What is this characteristic called?
a.
crest
b.
diffraction
c.
interference
d.
trough


____ 29. You are giving a presentation in science class about sound. You describe how the noise produced by the motor of a lawn mower hurts your ears.What term would you use to explain the way that you would reduce the noise of the mower?
a.
constructive interference
b.
destructive interference
c.
reflected sound
d.
refracted sound


____ 30. What kind of a wave travels along the coils of a spring?
a.
amplitude
b.
compressional
c.
frequency
d.
transverse


____ 31. The electromagnetic spectrum shows the range of electromagnetic waves. The wavelengths decrease at the bottom of the spectrum and increase at the top. What is the explanation for the range of wavelengths?
a.
Each wavelength is a different distance from the sun.
b.
Each wavelength has a different amplitude of vibration.
c.
Each wavelength has a different level of refraction.
d.
Each wavelength has a different frequency.


____ 32. Which one of the following is NOT an example of a mechanical wave?
a.
sound wave
c.
earthquake wave
b.
water wave
d.
radio wave


____ 33. Which one of the following is NOT an example of an electromagnetic wave?
a.
sound wave
c.
red light
b.
x-rays
d.
gamma rays


____ 34. Which one of the following is NOT an example of a compressional wave?
a.
wave moving through a coiled spring
b.
sound traveling through the air
c.
sound traveling through water
d.
green light traveling through the air


____ 35. Tsunamis have a large amount of energy because of their large ____.
a.
wavelength
c.
frequency
b.
amplitude
d.
diffraction


____ 36. Which one of the following determines the color of a light wave?
a.
amplitude only
c.
wavelength and frequency
b.
wavelength and amplitude
d.
interference patterns


____ 37. A place where molecules are far apart is a ____.
a.
refraction
c.
rarefaction
b.
reflection
d.
compression


____ 38. The speed of sound through air is about ____.
a.
340 m/s
c.
3,000,000 m/s
b.
2,000,000 m/s
d.
3,000,000 m/hour


____ 39. When light bounces off a surface it is called ____.
a.
reflection
c.
diffraction
b.
refraction
d.
interference


____ 40. In which one of the following cases will refraction occur?
a.
light traveling from air to glass
b.
light reflecting off of a mirror
c.
light bending around the corner of a door
d.
green light interfering with blue light


____ 41. Constructive interference occurs when waves meet ____.
a.
crest-to-crest and trough-to-trough
b.
crest-to-trough and crest-to-trough
c.
trough-to-crest and trough-to-crest
d.
crest-to-crest


____ 42. Waves can ____ when they move from one medium to another.
a.
disappear
c.
bend
b.
interfere
d.
split


____ 43. A(n) ____ wave DOES NOT need matter for energy transfer.
a.
electromagnetic
c.
compressional
b.
mechanical
d.
sound


____ 44. In a mechanical ____ wave, matter moves at a right angle to the wave direction.
a.
compressional
c.
light
b.
transverse
d.
electromagnetic


____ 45. The speed of sound in water is ____ the speed of sound in air.
a.
greater than
c.
equal to
b.
less than
d.
not greater than


____ 46. A region of spread-out particles in a compressional wave is called a(n) ____.
a.
compression
c.
interference
b.
rarefaction
d.
medium


____ 47. Waves can combine with each other; this is called ____.
a.
interference
c.
compression
b.
wave addition
d.
rarefaction


____ 48. Wave frequency is the ____ of waves passing a given point per second.
a.
amplitude
c.
speed
b.
wavelength
d.
number


____ 49. In a(n) ____ wave, matter moves back and forth in the same direction as the wave.
a.
compressional
c.
light
b.
transverse
d.
electromagnetic


____ 50. The action of a wave bouncing off a surface is called ____.
a.
rarefaction
c.
reflection
b.
refraction
d.
diffraction


____ 51. Amplitude reflects the amount of ____ in a wave.
a.
energy
c.
rarefaction
b.
compression
d.
speed


____ 52. A(n) ____ is the distance between a point on one wave and the identical point on the next wave.
a.
amplitude
c.
frequency
b.
wavelength
d.
compression


____ 53. The ____ of waves can change when the waves move from one medium to another.
a.
altitude
c.
speed
b.
amplitude
d.
compression


____ 54. A mechanical wave can travel only through ____.
a.
air
c.
matter
b.
water
d.
a vacuum


____ 55. The action of a wave bending around a barrier is called ____.
a.
reflection
c.
refraction
b.
diffraction
d.
rarefaction


____ 56. For significant ____ to occur, the wavelengths should match the size of the opening they are passing through.
a.
reflection
c.
refraction
b.
diffraction
d.
rarefaction


Completion
Complete each statement.

57. Waves are rhythmic disturbances that carry energy through matter or space without transferring ____________________.

58. Since sound is a mechanical wave it needs a ____________________ to travel through.

59. Waves that do not require matter to transfer energy are ____________________ waves.

60. ____________________ waves can be either transverse or compressional.

61. The less dense area of a compressional wave is called a(n) ____________________.

62. In a compressional wave, the amount of compression is like the ____________________ of a transverse wave.

63. The ____________________ is the unit of measure for the frequency of wavelengths per second.

64. Sound travels faster in ____________________ than in liquids.

65. An electromagnetic wave is slowed down if many ____________________ are in the medium.

66. Hertz can be described as ____________________.

67. The echo of a sound wave is due to ____________________ of the sound wave.

68. When light slows down as it passes from air to water it bends toward the ____________________.

69. The change in direction of waves when the wave travels from air to glass is ____________________.

70. Diffraction occurs when waves ____________________ around the edge of a barrier.

71. When two waves interact and their amplitudes cancel out, ____________________ interference has occurred.

72. Waves are ____________________ if they bounce off a surface.

73. Mechanical waves can be transverse or ____________________ waves.

74. The property of waves that allows them to bend around a barrier is ____________________.

75. Waves may bend if they move from one ____________________ to another.

76. Waves do not carry matter, but they do carry ____________________.

77. Wavelength, frequency, amplitude, and ____________________ are four characteristics of waves that can change.

78. In visible light, color is an indication of ____________________.

79. The common name for the reflection of sound waves is an ____________________.

80. In a compressional wave, one wavelength is the distance between adjacent compressions or adjacent ____________________.

81. Light waves travel more ____________________ as they enter water.

82. When light is reflected from a rough surface, the reflected light ____________________, producing no image.

83. Waves ____________________ best when their wavelength is similar in size to the opening they are moving through.

Matching

Match each item with the correct statement below.
a.
compressional wave
d.
mechanical wave
b.
electromagnetic wave
e.
transverse wave
c.
interference



____ 84. does not require a medium to travel through

____ 85. light waves and water waves are examples of this

____ 86. interaction of various different waves

____ 87. can be either transverse or compressional

____ 88. sound waves are an example of this

Match each item with the correct statement below.
a.
amplitude
d.
reflection
b.
diffraction
e.
refraction
c.
frequency



____ 89. the pitch of a sound wave

____ 90. why light shines off of a mirror

____ 91. related to the energy of a wave

____ 92. the changing of the speed of a wave

____ 93. the spreading out of waves around a barrier

Match each term with the correct description below.
a.
amplitude
j.
medium
b.
compression
k.
wave speed
c.
compressional wave
l.
rarefaction
d.
diffraction
m.
reflection
e.
electromagnetic wave
n.
refraction
f.
frequency
o.
transverse wave
g.
constructive interference
p.
wave
h.
destructive interference
q.
wavelength
i.
mechanical wave



____ 94. Squeezing a group of particles in a wave

____ 95. A transverse or compressional wave that can travel only through matter

____ 96. The matter through which a wave transfers energy

____ 97. A wave bends around a barrier

____ 98. A mechanical wave in which matter moves at right angles to the wave direction

____ 99. A wave in which matter moves back and forth in the direction the wave is moving

____ 100. A wave that doesn’t require matter to transfer energy

____ 101. A region of spread-out particles in a wave

____ 102. The distance from the crest or trough of a wave to the rest position

____ 103. The action of a wave bouncing off an object

____ 104. The number of waves passing a given point per second

____ 105. The product of wavelength and frequency

____ 106. A combination of waves form a smaller wave

____ 107. A combination of waves form a larger wave

____ 108. A rhythmic disturbance that carries energy

____ 109. A wave bends as it moves from one medium to another

____ 110. The distance between a point on a wave and the identical point on the next wave

Short Answer

111.
Explain how electromagnetic waves emitted by the sun affect you everyday.

112.
A boat in a lake is subjected to passing water waves. Describe the motion of the boat.

113.
Describe why you could not hear someone talk if you were both on the surface of the Moon.

114.
How can light travel from the Sun to Earth through the vacuum of space?

115.
How do your vocal cords produce sounds?

116.
Explain why a bright light differs from a dim light in terms of the amplitudes of each light wave.

117.
An instrument plays a pitch of 266 Hz. Another identical instrument plays a pitch of 400 Hz. How do the wavelength of each of these sound waves compare?

118.
Light that reflects off some surfaces can cause glare. Why don't all surfaces cause glare?

119.
A pencil is placed in a bucket of water. In some views, the pencil in the water will look bent when compared to the pencil above the water. Why is this so?

120.
Why is diffraction of light hard to detect?

121.
Describe how ear protectors help protect against hearing damage.

122. Study the following diagram. Then label the wave using the terms from the list.

amplitude
crest
trough
wavelength


123. Explain how the destructive interference of sound waves can help preserve hearing.

124. If the statement or term identifies a mechanical wave, list its letter under Mechanical Wave. If it identifies an electromagnetic wave, list its letter under Electromagnetic Wave. One or more terms might belong in both categories.

a. radio wave
d. visible light
g. transverse wave
b. sound wave
e. ocean wave
h. tidal wave
c. x rays
f. compressional wave
i. microwave

Mechanical Wave
Electromagnetic Wave
_____
_____
_____
_____
_____
_____
_____
_____
_____
_____
_____
_____


125. Compare and contrast transverse waves and compressional waves, and give an example of each type.

126. Calculate the wave speed of a 500-Hz wave with a wavelength of 0.5 m. First write the equation, then solve the problem, showing your work.

127. Assume that you hear a very low but very loud sound. What can you infer about the frequency and the amplitude of the sound waves you hear?

Problem

Figure 16-1

128. In Figure 16-1, what is the wavelength of Wave A?

129. In Figure 16-1, what is the wavelength of Wave B?

130. In Figure 16-1, what is the amplitude of Wave A.

131. In Figure 16-1, what is the amplitude of Wave B?

132. In Figure 16-1, which wave has the greater frequency?

133. In Figure 16-1, which wave has the least amount of energy?

134. When sunlight passes through a piece of glass known as a prism, the sunlight gets separated into the colors of the rainbow. Use the concept of refraction to explain how this occurs.

Essay

135.
Explain the differences and similarities between waves and particles.

Identify and explain what is responsible for each of the following effects.

136. You see a car behind you in the rearview mirror of your car.

137. You see a coin at the bottom of a fountain of water, but when you reach for it, it is in a different place than it appears to be.

138. You are in a cave with light coming in through a narrow crack in the ceiling. You can see a distinct beam of light on the floor, and you can see features of the cave illuminated by dim light.

139. Members of an orchestra tune their instruments before they begin to play. This produces a blast of confusing, disharmonious noise. When they begin to play in unison, the music from each instrument group is clear and loud. Explain these effects in terms of two types of interference.
6th Grade TEST - Chapter20 ONLINE REVIEW
Answer Section

TRUE/FALSE

1. ANS: T PTS: 1 DIF: Webb's I OBJ: 1/1
STA: SC.B.1.3.6

2. ANS: F PTS: 1 DIF: Webb's I OBJ: 1/1
STA: SC.B.1.3.6

3. ANS: F PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

4. ANS: T PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

5. ANS: F PTS: 1 DIF: Webb's I OBJ: 3/2
STA: SC.B.1.3.6

6. ANS: T PTS: 1 DIF: Webb's I OBJ: 3/2
STA: SC.B.1.3.6

7. ANS: T PTS: 1 DIF: Webb's I OBJ: 4/2
STA: SC.B.1.3.1

8. ANS: F PTS: 1 DIF: Webb's I OBJ: 5/3

9. ANS: F PTS: 1 DIF: Webb's I OBJ: 6/3

10. ANS: T PTS: 1 DIF: Webb's I OBJ: 7/3
STA: SC.B.1.3.6

11. ANS: T PTS: 1

12. ANS: F PTS: 1

13. ANS: F PTS: 1

14. ANS: F PTS: 1

15. ANS: T PTS: 1

16. ANS: F PTS: 1

17. ANS: F PTS: 1

18. ANS: T PTS: 1

MULTIPLE CHOICE

19. ANS: B PTS: 1 DIF: Webb's I

20. ANS: C PTS: 1 DIF: Webb's I

21. ANS: A PTS: 1 DIF: Webb's I

22. ANS: A PTS: 1 DIF: Webb's I

23. ANS: D PTS: 1 DIF: Webb's II

24. ANS: C PTS: 1 DIF: Webb's II

25. ANS: B PTS: 1 DIF: Webb's I

26. ANS: A PTS: 1 DIF: Webb's II

27. ANS: C PTS: 1 DIF: Webb's I

28. ANS: C PTS: 1 DIF: Webb's I

29. ANS: B PTS: 1 DIF: Webb's II

30. ANS: B PTS: 1

31. ANS: D PTS: 1 DIF: Webb's II

32. ANS: D PTS: 1 DIF: Webb's I OBJ: 1/1
STA: SC.B.1.3.6

33. ANS: A PTS: 1 DIF: Webb's I OBJ: 1/1
STA: SC.B.1.3.6

34. ANS: D PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

35. ANS: B PTS: 1 DIF: Webb's I OBJ: 3/2
STA: SC.B.1.3.6

36. ANS: C PTS: 1 DIF: Webb's I OBJ: 3/2
STA: SC.B.1.3.6

37. ANS: C PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

38. ANS: A PTS: 1 DIF: Webb's I OBJ: 4/2
STA: SC.B.1.3.6

39. ANS: A PTS: 1 DIF: Webb's I OBJ: 5/3

40. ANS: A PTS: 1 DIF: Webb's I OBJ: 6/3

41. ANS: D PTS: 1 DIF: Webb's I OBJ: 7/3
STA: SC.B.1.3.6

42. ANS: C PTS: 1

43. ANS: A PTS: 1

44. ANS: B PTS: 1

45. ANS: A PTS: 1

46. ANS: B PTS: 1

47. ANS: A PTS: 1

48. ANS: D PTS: 1

49. ANS: A PTS: 1

50. ANS: C PTS: 1

51. ANS: A PTS: 1

52. ANS: B PTS: 1

53. ANS: C PTS: 1

54. ANS: C PTS: 1

55. ANS: B PTS: 1

56. ANS: B PTS: 1

COMPLETION

57. ANS: matter

PTS: 1 DIF: Webb's I OBJ: 1/1 STA: SC.B.1.3.6

58. ANS: medium

PTS: 1 DIF: Webb's I OBJ: 1/1 STA: SC.B.1.3.6

59. ANS: electromagnetic

PTS: 1 DIF: Webb's I OBJ: 1/1 STA: SC.B.1.3.6

60. ANS: Mechanical

PTS: 1 DIF: Webb's I OBJ: 2/1 STA: SC.B.1.3.6

61. ANS: rarefaction

PTS: 1 DIF: Webb's I OBJ: 2/1 STA: SC.B.1.3.6

62. ANS: amplitude

PTS: 1 DIF: Webb's I OBJ: 2/1 STA: SC.B.1.3.6

63. ANS: hertz

PTS: 1 DIF: Webb's I OBJ: 3/2 STA: SC.B.1.3.6

64. ANS: solids

PTS: 1 DIF: Webb's I OBJ: 4/2

65. ANS: atoms

PTS: 1 DIF: Webb's I OBJ: 4/2 STA: SC.B.1.3.6

66. ANS: waves per second

PTS: 1 DIF: Webb's I OBJ: 3/2 STA: SC.B.1.3.6

67. ANS: reflection

PTS: 1 DIF: Webb's I OBJ: 5/3

68. ANS: normal

PTS: 1 DIF: Webb's I OBJ: 6/3 STA: SC.B.1.3.6

69. ANS: refraction

PTS: 1 DIF: Webb's I OBJ: 6/3 STA: SC.B.1.3.6

70. ANS: bend

PTS: 1 DIF: Webb's I OBJ: 7/3 STA: SC.B.1.3.6

71. ANS: destructive

PTS: 1 DIF: Webb's I OBJ: 7/3 STA: SC.B.1.3.6

72. ANS: reflected

PTS: 1

73. ANS: compressional

PTS: 1

74. ANS: diffraction

PTS: 1

75. ANS: medium

PTS: 1

76. ANS: energy

PTS: 1

77. ANS: wave speed

PTS: 1

78. ANS: wavelength

PTS: 1

79. ANS: echo

PTS: 1

80. ANS: rarefactions

PTS: 1

81. ANS: slowly

PTS: 1

82. ANS: scatters

PTS: 1

83. ANS: diffract

PTS: 1

MATCHING

84. ANS: B PTS: 1 DIF: Webb's I OBJ: 1/1
STA: SC.B.1.3.6

85. ANS: E PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

86. ANS: C PTS: 1 DIF: Webb's I OBJ: 7/3
STA: SC.B.1.3.6

87. ANS: D PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

88. ANS: A PTS: 1 DIF: Webb's I OBJ: 2/1
STA: SC.B.1.3.6

89. ANS: C PTS: 1 DIF: Webb's I OBJ: 3/2
STA: SC.B.1.3.6

90. ANS: D PTS: 1 DIF: Webb's I OBJ: 5/3
STA: SC.B.1.3.6

91. ANS: A PTS: 1 DIF: Webb's I OBJ: 3/2
STA: SC.B.1.3.6

92. ANS: E PTS: 1 DIF: Webb's I OBJ: 6/3
STA: SC.B.1.3.6

93. ANS: B PTS: 1 DIF: Webb's I OBJ: 7/3
STA: SC.B.1.3.6

94. ANS: B PTS: 1

95. ANS: I PTS: 1

96. ANS: J PTS: 1

97. ANS: D PTS: 1

98. ANS: O PTS: 1

99. ANS: C PTS: 1

100. ANS: E PTS: 1

101. ANS: L PTS: 1

102. ANS: A PTS: 1

103. ANS: M PTS: 1

104. ANS: F PTS: 1

105. ANS: K PTS: 1

106. ANS: H PTS: 1

107. ANS: G PTS: 1

108. ANS: P PTS: 1

109. ANS: N PTS: 1

110. ANS: Q PTS: 1

SHORT ANSWER

111. ANS:
Electromagnetic waves carry radiant energy from the sun. Ninety two percent of the radiant energy from the sun is carried by infrared and invisible light waves. Infrared waves make you feel warm when you sit in the sun. Visible light rays let you see. Ultraviolet waves cause sunburn.

PTS: 1 DIF: Webb's II

112. ANS:
The boat will bob up and down due to the crests and troughs of the water waves. The waves will not move the boat horizontally because waves do not move matter.

PTS: 1 DIF: Webb's II OBJ: 1/1 STA: SC.B.1.3.6

113. ANS:
Since the moon has no air, sound cannot move from the person to you.

PTS: 1 DIF: Webb's II OBJ: 1/1 STA: SC.B.1.3.6

114. ANS:
Since light is a type of electromagnetic wave, it does not require a medium through which to travel.

PTS: 1 DIF: Webb's II OBJ: 1/1 STA: SC.B.1.3.6

115. ANS:
The vocal cords vibrate, causing air in your throat to vibrate.

PTS: 1 DIF: Webb's II OBJ: 2/1 STA: SC.B.1.3.6

116. ANS:
The bright light has more energy (higher amplitude) than a dim light (lower amplitude).

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

117. ANS:
The wave with the lower pitch (266 Hz) will have the longer wavelength.

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

118. ANS:
Some surfaces are rough. Light will reflect in many directions, not just in one main direction like off a smooth surface.

PTS: 1 DIF: Webb's II OBJ: 5/3

119. ANS:
Light waves are refracted as the light travels from air to water. This causes a bending of light and therefore the apparent bending of the pencil.

PTS: 1 DIF: Webb's III OBJ: 6/3 STA: SC.B.1.3.6

120. ANS:
The wavelength of light is so much smaller than the lengths of objects in our everyday life.

PTS: 1 DIF: Webb's II OBJ: 7/3 STA: SC.B.1.3.6

121. ANS:
Ear protectors help absorb some of the energy of the sound wave, so that the amplitude of the sound waves reaching the ear is less.

PTS: 1 DIF: Webb's II OBJ: 7/3 STA: SC.B.1.3.6

122. ANS:
1. trough
2. crest
3. wavelength
4. amplitude

PTS: 1

123. ANS:
Destructive interference of loud sound waves may reduce or even eliminate them. Loud sounds in the environment contribute to hearing loss.

PTS: 1

124. ANS:

Mechanical Wave
Electromagnetic Wave
__b__
__a__
__e__
__c__
__f__
__d__
__g__
__g__
__h__
__i__


PTS: 1

125. ANS:
In a transverse wave, matter in the medium moves back and forth at right angles to the direction the wave travels. Examples may include waves in a tethered rope, in water, or any electromagnetic wave. Accept any appropriate answer. In a compressional wave, matter in the medium moves back and forth in the direction the wave travels. Examples may include sound waves or waves along a coiled spring. Accept any appropriate answer.

PTS: 1

126. ANS:
Wave speed = wave frequency ´ wavelength

= 500 Hz · 0.5 m (or 500 waves/sec · 0.5 m/wave)
= 250 m/s


PTS: 1

127. ANS:
They are low frequency and large amplitude.

PTS: 1

PROBLEM

128. ANS:
8 m

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

129. ANS:
4 m

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

130. ANS:
5 m

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

131. ANS:
20 m

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

132. ANS:
Wave B

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

133. ANS:
Wave A, because it has the lowest amplitude.

PTS: 1 DIF: Webb's II OBJ: 3/2 STA: SC.B.1.3.6

134. ANS:
As the sunlight goes from air to glass, the various colors change speed. The colors separate because each light color will have a different change of speed.

PTS: 1 DIF: Webb's II OBJ: 6/3 STA: SC.B.1.3.6

ESSAY

135. ANS:
A wave is a disturbance. A particle is matter. Particles take up space and volume and they have an electrical charge. Waves have amplitude, wavelengths, and frequency. Waves move with a certain speed in a given material. The motion of both can be described by direction and speed. Both waves and particles can transfer energy from place to place.

PTS: 1 DIF: Webb's II

136. ANS:
Light is reflected off the car behind you. The reflected light is then again reflected off the rearview mirror, producing the image of the car.

PTS: 1

137. ANS:
Refraction produces the optical illusion. Refraction is the bending of a wave as it passes from one medium to another, in this case, from air to water

PTS: 1

138. ANS:
Diffraction allows you to see objects outside the shaft of light. Diffraction is the bending of a wave around a barrier, in this case, the edges of the crack in the rock.

PTS: 1

139. ANS:
The simultaneous tuning of all of the instruments produces a great deal of destructive interference. Playing in unison produces largely constructive interference.

PTS: 1