Midterm Review
7th Grade Midterm 2013
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. How are the noble gases different from other groups of elements?
a.Their atoms do not react easily with other atoms.
b.They are nonmetals.
c.They have no valence electrons.
d.Their atoms react only with each other.
____ 2. Each family in the periodic table has its own characteristic properties based on the number of
a.neutrons.
b. valence electrons.
c. protons.
d. ions.
____ 3. Very energetic particles that move rapidly in all directions in the space outside the nucleus of an atom are
a. ions.
b. neutrons.
c. electrons.
d. protons.
____ 4. Which particles in an atom are in the nucleus?
a. protons and neutrons
b. protons and electrons
c. protons and ions
d. electrons and neutrons
____ 5. Atoms are electrically neutral because they have
a. equal numbers of protons and neutrons.
b. equal numbers of electrons and neutrons.
c. equal numbers of protons and electrons.
d. no charged particles.
____ 6. Which of these particles has a positive charge?
a. atom
b.proton
c.neutron
d.electron
____ 7. Electrons involved in bonding between atoms are
a. valence electrons.
b. inside the nucleus.
c.closest to the nucleus.
d. positively charged.
____ 8. What is the greatest number of valence electrons an atom can have?
a. 1
b. 3
c. 8
d. 12
____ 9. The atomic number is the number of
a. protons in the nucleus of an atom.
b. neutrons in the nucleus of an atom.
c. valence electrons in an atom.
d. electrons in the nucleus of an atom.
____ 10. A row across the periodic table is called a
a. group.
b. family.
c. section.
d. period.
____ 11. How many groups are in the periodic table?
a. 7
b. 8
c. 18
d. 112
____ 12. If atoms of a halogen nonmetal gain one electron, the atoms then have
a. no valence electrons.
b. 7 valence electrons.
c. 8 valence electrons.
d. 17 valence electrons.
____ 13. A disturbance that transfers energy from place to place is called a
a. wave.
b. medium.
c. vibration.
d. compression.
____ 14. Waves are created when a source of energy causes a medium to
a. move.
b. compress.
c. expand.
d. vibrate.
____ 15. The highest parts of a transverse wave are called
a.
troughs.
b. crests.
c. nodes.
d. wavelengths.
____ 16. Waves that move the particles of the medium parallel to the direction in which the waves are traveling are called
a. longitudinal waves.
b. transverse waves.
c. surface waves.
d. combination waves.
____ 17. The maximum distance that the particles of a medium move from the rest position is the
a. amplitude of the wave.
b. wavelength of the wave.
c. frequency of the wave.
d. speed of the wave.
____ 18. The distance between two corresponding parts of a wave is the wave’s
a. amplitude.
b. wavelength.
c. frequency.
d. speed.
____ 19. The speed of a wave is its wavelength multiplied by its
a. amplitude.
b. vibration.
c. frequency.
d. reflection.
____ 20. Which of the following affects the speed of sound waves traveling through the air?
a. how loud the sound is
b. the air temperature
c. how often the sound is repeated
d. the amplitude of the waves
____ 21. The bending of waves due to a change in speed is called
a. reflection.
b. refraction.
c. diffraction.
d. interference.
____ 22. The bending of waves around the edge of a barrier is known as
a. reflection.
b. refraction.
c. diffraction.
d. interference.
____ 23. The interaction between two waves that meet is called
a. reflection.
b. refraction.
c. diffraction.
d. interference.
____ 24. Waves combine to make a wave with larger amplitude in a process called
a. destructive interference.
b. constructive interference.
c. reflection.
d. refraction.
____ 25. When an incoming wave combines with a reflected wave in such a way that the combined wave appears to be standing still, the result is a
a. longitudinal wave.
b. standing wave.
c. transverse wave.
d. surface wave.
____ 26. What occurs when vibrations traveling through an object match the object’s natural frequency?
a. reflection
b. refraction
c. diffraction
d. resonance
____ 27. Waves produced by earthquakes are called
a. standing waves.
b. transverse waves.
c. seismic waves.
d. longitudinal waves.
____ 28. In which direction(s) do seismic waves travel from their point of origin?
a. north to south only
b. toward the equator only
c. in all directions
d. inward, toward Earth’s core
____ 29. Longitudinal seismic waves are known as
a. primary waves.
b. secondary waves.
c. surface waves.
d. transverse waves.
____ 30. Secondary waves CANNOT travel through
a. rock.
b. liquids.
c. Earth’s mantle.
d. Earth’s crust.
____ 31. Which waves arrive at a seismograph first?
a. P waves
b. S waves
c. transverse waves
d surface waves
____ 32. What is another use of a seismograph aside from detecting earthquakes?
a. measuring tsunamis
b locating pockets of valuable resources underground
c. predicting accurately when and where volcanoes will erupt
d. locating gold dust in rivers
____ 33. What are the highest and lowest points on a standing wave called?
a. nodes
b antinodes
c. compressions
d. rarefactions
____ 34. The material through which a wave travels is called a
a. vibration.
b. medium.
c. crest.
d. trough.
____ 35. Waves are classified according to
a. their size.
b. their shape.
c. how they move.
d. their source.
____ 36. Waves in a pond or lake are
a. longitudinal waves.
b. transverse waves.
c. surface waves.
d. standing waves.
____ 37. Frequency is measured in units called
a. amps.
b. hertz.
c. nodes.
d. antinodes.
____ 38. When a wave hits a surface through which it CANNOT pass and bounces back, it undergoes
a.
reflection.
b.
refraction.
c.
constructive interference.
d.
destructive interference.
____ 39. Waves combine to produce a smaller or zero-amplitude wave in a process called
a.
destructive interference.
b.
constructive interference.
c.
reflection.
d.
refraction.
____ 40. Sound is a disturbance that travels through a medium as a
a.
longitudinal wave.
b.
surface wave.
c.
standing wave.
d.
transverse wave.
____ 41. Sound does NOT travel through
a.
air.
b.
liquids.
c.
solids.
d.
outer space.
____ 42. The speed of sound depends on
a.
the loudness of the sound.
b.
the pitch of the sound.
c.
the source of the sound.
d.
the properties of the medium it travels through.
____ 43. The ability of a material to bounce back after being disturbed is called
a.
density.
b.
elasticity.
c.
intensity.
d.
frequency.
____ 44. The first person to break the sound barrier was
a.
Orville Wright.
b.
Andy Green.
c.
Chuck Yeager.
d.
John Glenn.
____ 45. The amount of energy a sound wave carries per second through a unit area is its
a.
loudness.
b.
intensity.
c.
frequency.
d.
pitch.
____ 46. Loudness, or sound level, is measured in units called
a.
decibels.
b.
hertz.
c.
meters per second.
d.
watts per square meter.
____ 47. Which term refers to how high or low a sound seems to a person?
a.
loudness
b.
intensity
c.
frequency
d.
pitch
____ 48. The pitch of a sound that you hear depends on the sound wave’s
a.
loudness.
b.
frequency.
c.
intensity.
d.
speed.
____ 49. The changing pitch of a police car’s siren as it moves by you is an example of
a.
the Doppler effect.
b.
resonance.
c.
the speed of sound.
d.
intensity.
____ 50. As a sound source moves toward a listener, the pitch
a.
appears to decrease.
b.
appears to increase.
c.
stays the same.
d.
goes up and down repeatedly.
____ 51. What is a set of tones combined in a way that is pleasing to the ear?
a.
noise
b.
sound
c.
music
d.
timbre
____ 52. What occurs when two or more sound waves interact?
a.
interference
b.
Doppler effect
c.
resonance
d.
ultrasound
____ 53. Which of the following can cause hearing loss?
a.
listening to soft music
b.
going outside in cold weather
c.
viral or bacterial infections
d.
working in a quiet office
____ 54. The most common type of hearing loss is due to
a.
injury.
b.
infection.
c.
loud noise or music.
d.
aging.
____ 55. What do some bats use to locate food and to navigate?
a.
dissonance
b.
echolocation
c.
infrasound
d.
acoustics
____ 56. Sound waves with frequencies above 20,000 Hz are called
a.
ultrasound.
b.
infrasound.
c.
sonar.
d.
echolocation.
____ 57. You can hear sounds from around corners because of
a.
refraction.
b.
reflection.
c.
diffraction.
d.
elasticity.
____ 58. Sound travels more slowly
a.
in dense materials.
b.
in mediums that have a high degree of elasticity.
c.
at high temperatures.
d.
at low altitudes.
____ 59. Sound waves with frequencies below the normal human range of hearing are called
a.
ultrasound.
b.
infrasound.
c.
resonance.
d.
decibels.
____ 60. What is a mixture of sound waves that do not sound pleasing together called?
a.
music
b.
noise
c.
timbre
d.
pitch
____ 61. Which household item might use ultrasound?
a.
toaster oven
b.
coffee machine
c.
hair dryer
d.
electric toothbrush
____ 62. Which waves have some electrical properties and some magnetic properties?
a.
longitudinal waves
b.
transverse waves
c.
mechanical waves
d.
electromagnetic waves
____ 63. Electromagnetic waves can transfer energy without a(n)
a.
medium.
b.
electric field.
c.
magnetic field.
d.
change in either a magnetic or an electric field.
____ 64. Light that has passed through a polarizing filter is called
a.
transverse light.
b.
polarized light.
c.
white light.
d.
photoelectric light.
____ 65. In 1905, Albert Einstein suggested that light energy travels in tiny packets or particles called
a.
neutrons.
b.
electrons.
c.
photons.
d.
gamma rays.
____ 66. All electromagnetic waves have the same
a.
wavelength.
b.
frequency.
c.
speed.
d.
amplitude.
____ 67. Visible light has a higher frequency than
a.
X-rays.
b.
ultraviolet rays.
c.
infrared rays.
d.
gamma rays.
____ 68. The range of electromagnetic waves placed in a certain order is called the
a.
electromagnetic spectrum.
b.
electromagnetic wavelength.
c.
electromagnetic frequency.
d.
electromagnetic field.
____ 69. The electromagnetic waves with the highest frequencies are called
a.
radio waves.
b.
gamma rays.
c.
X-rays.
d.
visible light.
____ 70. When a police officer uses radar for speed control, the officer is using what kind of electromagnetic waves?
a.
radio waves
b.
gamma rays
c.
ultraviolet rays
d.
X-rays
____ 71. Visible light can be separated into the various colors of the visible spectrum to form a(n)
a.
rainbow.
b.
thermogram.
c.
MRI.
d.
X-ray picture.
____ 72. Which type of light bulb glows when a filament inside it gets hot?
a.
incandescent
b.
fluorescent
c.
sodium vapor
d.
neon
____ 73. Which light bulbs are coated on the inside with a powder?
a.
incandescent
b.
fluorescent
c.
neon
d.
sodium vapor
____ 74. What kind of waves do cellular telephones use to transmit and receive signals?
a.
gamma rays
b.
microwaves
c.
ultraviolet rays
d.
infrared rays
____ 75. Which type of light bulb is commonly used in advertising signs and decoration?
a.
incandescent
b.
fluorescent
c.
neon
d.
sodium vapor
____ 76. Which electromagnetic waves have the longest wavelengths and lowest frequencies?
a.
infrared waves
b.
radio waves
c.
ultraviolet rays
d.
gamma rays
____ 77. On AM broadcasts, what remains constant?
a.
the amplitude
b.
the music
c.
the frequency
d.
the speech
____ 78. Microwaves can be used to
a.
treat cancer.
b.
make rainbows.
c.
heat food.
d.
create an X-ray image.
____ 79. The process that uses radio waves and magnetism to produce images of tissues in the human body is called
a.
ultrasound.
b.
radar.
c.
magnetic resonance imaging.
d.
radiation treatment.
____ 80. The images made by an infrared camera are called
a.
X-rays.
b.
thermograms.
c.
magnetic resonance images.
d.
ultraviolet images.
____ 81. Which of the following is true of ultraviolet rays?
a.
They are visible.
b.
They carry information to televisions and radios.
c.
They help your body produce vitamin D.
d.
They provide the energy that makes your morning toast.
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____ 82. The nucleus of an atom is the region where the protons and neutrons can be found. _________________________
____ 83. The valence electrons are those electrons found closest to the nucleus. _________________________
____ 84. The atomic number is the number of protons in the nucleus of the atom. _________________________
____ 85. Each family in the periodic table has its own characteristic properties based upon its number of valence electrons. _________________________
____ 86. Waves that require a medium through which to pass are called electromagnetic waves. _________________________
____ 87. In transverse waves, the medium moves at right angles to the direction in which the wave is traveling. _________________________
____ 88. The unit associated with amplitude is the hertz. _________________________
____ 89. Sound waves travel at different speeds in different mediums. _________________________
____ 90. Constructive interference occurs when the amplitudes of two waves combine to produce a wave with a smaller amplitude. _________________________
____ 91. The waves produced by earthquakes are known as seismic waves. _________________________
____ 92. The speed of sound in air decreases with increasing temperature. _________________________
____ 93. Interference occurs when two or more sound waves interact. _________________________
____ 94. It is not safe to put objects into your ear, even to clean it, because you may puncture the eardrum. _________________________
____ 95. Electromagnetic waves with the longest wavelengths have the highest frequencies. _________________________
____ 96. Electromagnetic waves that have wavelengths slightly shorter than those of visible light are called ultraviolet rays. _________________________
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. How are the noble gases different from other groups of elements?
a.Their atoms do not react easily with other atoms.
b.They are nonmetals.
c.They have no valence electrons.
d.Their atoms react only with each other.
____ 2. Each family in the periodic table has its own characteristic properties based on the number of
a.neutrons.
b. valence electrons.
c. protons.
d. ions.
____ 3. Very energetic particles that move rapidly in all directions in the space outside the nucleus of an atom are
a. ions.
b. neutrons.
c. electrons.
d. protons.
____ 4. Which particles in an atom are in the nucleus?
a. protons and neutrons
b. protons and electrons
c. protons and ions
d. electrons and neutrons
____ 5. Atoms are electrically neutral because they have
a. equal numbers of protons and neutrons.
b. equal numbers of electrons and neutrons.
c. equal numbers of protons and electrons.
d. no charged particles.
____ 6. Which of these particles has a positive charge?
a. atom
b.proton
c.neutron
d.electron
____ 7. Electrons involved in bonding between atoms are
a. valence electrons.
b. inside the nucleus.
c.closest to the nucleus.
d. positively charged.
____ 8. What is the greatest number of valence electrons an atom can have?
a. 1
b. 3
c. 8
d. 12
____ 9. The atomic number is the number of
a. protons in the nucleus of an atom.
b. neutrons in the nucleus of an atom.
c. valence electrons in an atom.
d. electrons in the nucleus of an atom.
____ 10. A row across the periodic table is called a
a. group.
b. family.
c. section.
d. period.
____ 11. How many groups are in the periodic table?
a. 7
b. 8
c. 18
d. 112
____ 12. If atoms of a halogen nonmetal gain one electron, the atoms then have
a. no valence electrons.
b. 7 valence electrons.
c. 8 valence electrons.
d. 17 valence electrons.
____ 13. A disturbance that transfers energy from place to place is called a
a. wave.
b. medium.
c. vibration.
d. compression.
____ 14. Waves are created when a source of energy causes a medium to
a. move.
b. compress.
c. expand.
d. vibrate.
____ 15. The highest parts of a transverse wave are called
a.
troughs.
b. crests.
c. nodes.
d. wavelengths.
____ 16. Waves that move the particles of the medium parallel to the direction in which the waves are traveling are called
a. longitudinal waves.
b. transverse waves.
c. surface waves.
d. combination waves.
____ 17. The maximum distance that the particles of a medium move from the rest position is the
a. amplitude of the wave.
b. wavelength of the wave.
c. frequency of the wave.
d. speed of the wave.
____ 18. The distance between two corresponding parts of a wave is the wave’s
a. amplitude.
b. wavelength.
c. frequency.
d. speed.
____ 19. The speed of a wave is its wavelength multiplied by its
a. amplitude.
b. vibration.
c. frequency.
d. reflection.
____ 20. Which of the following affects the speed of sound waves traveling through the air?
a. how loud the sound is
b. the air temperature
c. how often the sound is repeated
d. the amplitude of the waves
____ 21. The bending of waves due to a change in speed is called
a. reflection.
b. refraction.
c. diffraction.
d. interference.
____ 22. The bending of waves around the edge of a barrier is known as
a. reflection.
b. refraction.
c. diffraction.
d. interference.
____ 23. The interaction between two waves that meet is called
a. reflection.
b. refraction.
c. diffraction.
d. interference.
____ 24. Waves combine to make a wave with larger amplitude in a process called
a. destructive interference.
b. constructive interference.
c. reflection.
d. refraction.
____ 25. When an incoming wave combines with a reflected wave in such a way that the combined wave appears to be standing still, the result is a
a. longitudinal wave.
b. standing wave.
c. transverse wave.
d. surface wave.
____ 26. What occurs when vibrations traveling through an object match the object’s natural frequency?
a. reflection
b. refraction
c. diffraction
d. resonance
____ 27. Waves produced by earthquakes are called
a. standing waves.
b. transverse waves.
c. seismic waves.
d. longitudinal waves.
____ 28. In which direction(s) do seismic waves travel from their point of origin?
a. north to south only
b. toward the equator only
c. in all directions
d. inward, toward Earth’s core
____ 29. Longitudinal seismic waves are known as
a. primary waves.
b. secondary waves.
c. surface waves.
d. transverse waves.
____ 30. Secondary waves CANNOT travel through
a. rock.
b. liquids.
c. Earth’s mantle.
d. Earth’s crust.
____ 31. Which waves arrive at a seismograph first?
a. P waves
b. S waves
c. transverse waves
d surface waves
____ 32. What is another use of a seismograph aside from detecting earthquakes?
a. measuring tsunamis
b locating pockets of valuable resources underground
c. predicting accurately when and where volcanoes will erupt
d. locating gold dust in rivers
____ 33. What are the highest and lowest points on a standing wave called?
a. nodes
b antinodes
c. compressions
d. rarefactions
____ 34. The material through which a wave travels is called a
a. vibration.
b. medium.
c. crest.
d. trough.
____ 35. Waves are classified according to
a. their size.
b. their shape.
c. how they move.
d. their source.
____ 36. Waves in a pond or lake are
a. longitudinal waves.
b. transverse waves.
c. surface waves.
d. standing waves.
____ 37. Frequency is measured in units called
a. amps.
b. hertz.
c. nodes.
d. antinodes.
____ 38. When a wave hits a surface through which it CANNOT pass and bounces back, it undergoes
a.
reflection.
b.
refraction.
c.
constructive interference.
d.
destructive interference.
____ 39. Waves combine to produce a smaller or zero-amplitude wave in a process called
a.
destructive interference.
b.
constructive interference.
c.
reflection.
d.
refraction.
____ 40. Sound is a disturbance that travels through a medium as a
a.
longitudinal wave.
b.
surface wave.
c.
standing wave.
d.
transverse wave.
____ 41. Sound does NOT travel through
a.
air.
b.
liquids.
c.
solids.
d.
outer space.
____ 42. The speed of sound depends on
a.
the loudness of the sound.
b.
the pitch of the sound.
c.
the source of the sound.
d.
the properties of the medium it travels through.
____ 43. The ability of a material to bounce back after being disturbed is called
a.
density.
b.
elasticity.
c.
intensity.
d.
frequency.
____ 44. The first person to break the sound barrier was
a.
Orville Wright.
b.
Andy Green.
c.
Chuck Yeager.
d.
John Glenn.
____ 45. The amount of energy a sound wave carries per second through a unit area is its
a.
loudness.
b.
intensity.
c.
frequency.
d.
pitch.
____ 46. Loudness, or sound level, is measured in units called
a.
decibels.
b.
hertz.
c.
meters per second.
d.
watts per square meter.
____ 47. Which term refers to how high or low a sound seems to a person?
a.
loudness
b.
intensity
c.
frequency
d.
pitch
____ 48. The pitch of a sound that you hear depends on the sound wave’s
a.
loudness.
b.
frequency.
c.
intensity.
d.
speed.
____ 49. The changing pitch of a police car’s siren as it moves by you is an example of
a.
the Doppler effect.
b.
resonance.
c.
the speed of sound.
d.
intensity.
____ 50. As a sound source moves toward a listener, the pitch
a.
appears to decrease.
b.
appears to increase.
c.
stays the same.
d.
goes up and down repeatedly.
____ 51. What is a set of tones combined in a way that is pleasing to the ear?
a.
noise
b.
sound
c.
music
d.
timbre
____ 52. What occurs when two or more sound waves interact?
a.
interference
b.
Doppler effect
c.
resonance
d.
ultrasound
____ 53. Which of the following can cause hearing loss?
a.
listening to soft music
b.
going outside in cold weather
c.
viral or bacterial infections
d.
working in a quiet office
____ 54. The most common type of hearing loss is due to
a.
injury.
b.
infection.
c.
loud noise or music.
d.
aging.
____ 55. What do some bats use to locate food and to navigate?
a.
dissonance
b.
echolocation
c.
infrasound
d.
acoustics
____ 56. Sound waves with frequencies above 20,000 Hz are called
a.
ultrasound.
b.
infrasound.
c.
sonar.
d.
echolocation.
____ 57. You can hear sounds from around corners because of
a.
refraction.
b.
reflection.
c.
diffraction.
d.
elasticity.
____ 58. Sound travels more slowly
a.
in dense materials.
b.
in mediums that have a high degree of elasticity.
c.
at high temperatures.
d.
at low altitudes.
____ 59. Sound waves with frequencies below the normal human range of hearing are called
a.
ultrasound.
b.
infrasound.
c.
resonance.
d.
decibels.
____ 60. What is a mixture of sound waves that do not sound pleasing together called?
a.
music
b.
noise
c.
timbre
d.
pitch
____ 61. Which household item might use ultrasound?
a.
toaster oven
b.
coffee machine
c.
hair dryer
d.
electric toothbrush
____ 62. Which waves have some electrical properties and some magnetic properties?
a.
longitudinal waves
b.
transverse waves
c.
mechanical waves
d.
electromagnetic waves
____ 63. Electromagnetic waves can transfer energy without a(n)
a.
medium.
b.
electric field.
c.
magnetic field.
d.
change in either a magnetic or an electric field.
____ 64. Light that has passed through a polarizing filter is called
a.
transverse light.
b.
polarized light.
c.
white light.
d.
photoelectric light.
____ 65. In 1905, Albert Einstein suggested that light energy travels in tiny packets or particles called
a.
neutrons.
b.
electrons.
c.
photons.
d.
gamma rays.
____ 66. All electromagnetic waves have the same
a.
wavelength.
b.
frequency.
c.
speed.
d.
amplitude.
____ 67. Visible light has a higher frequency than
a.
X-rays.
b.
ultraviolet rays.
c.
infrared rays.
d.
gamma rays.
____ 68. The range of electromagnetic waves placed in a certain order is called the
a.
electromagnetic spectrum.
b.
electromagnetic wavelength.
c.
electromagnetic frequency.
d.
electromagnetic field.
____ 69. The electromagnetic waves with the highest frequencies are called
a.
radio waves.
b.
gamma rays.
c.
X-rays.
d.
visible light.
____ 70. When a police officer uses radar for speed control, the officer is using what kind of electromagnetic waves?
a.
radio waves
b.
gamma rays
c.
ultraviolet rays
d.
X-rays
____ 71. Visible light can be separated into the various colors of the visible spectrum to form a(n)
a.
rainbow.
b.
thermogram.
c.
MRI.
d.
X-ray picture.
____ 72. Which type of light bulb glows when a filament inside it gets hot?
a.
incandescent
b.
fluorescent
c.
sodium vapor
d.
neon
____ 73. Which light bulbs are coated on the inside with a powder?
a.
incandescent
b.
fluorescent
c.
neon
d.
sodium vapor
____ 74. What kind of waves do cellular telephones use to transmit and receive signals?
a.
gamma rays
b.
microwaves
c.
ultraviolet rays
d.
infrared rays
____ 75. Which type of light bulb is commonly used in advertising signs and decoration?
a.
incandescent
b.
fluorescent
c.
neon
d.
sodium vapor
____ 76. Which electromagnetic waves have the longest wavelengths and lowest frequencies?
a.
infrared waves
b.
radio waves
c.
ultraviolet rays
d.
gamma rays
____ 77. On AM broadcasts, what remains constant?
a.
the amplitude
b.
the music
c.
the frequency
d.
the speech
____ 78. Microwaves can be used to
a.
treat cancer.
b.
make rainbows.
c.
heat food.
d.
create an X-ray image.
____ 79. The process that uses radio waves and magnetism to produce images of tissues in the human body is called
a.
ultrasound.
b.
radar.
c.
magnetic resonance imaging.
d.
radiation treatment.
____ 80. The images made by an infrared camera are called
a.
X-rays.
b.
thermograms.
c.
magnetic resonance images.
d.
ultraviolet images.
____ 81. Which of the following is true of ultraviolet rays?
a.
They are visible.
b.
They carry information to televisions and radios.
c.
They help your body produce vitamin D.
d.
They provide the energy that makes your morning toast.
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____ 82. The nucleus of an atom is the region where the protons and neutrons can be found. _________________________
____ 83. The valence electrons are those electrons found closest to the nucleus. _________________________
____ 84. The atomic number is the number of protons in the nucleus of the atom. _________________________
____ 85. Each family in the periodic table has its own characteristic properties based upon its number of valence electrons. _________________________
____ 86. Waves that require a medium through which to pass are called electromagnetic waves. _________________________
____ 87. In transverse waves, the medium moves at right angles to the direction in which the wave is traveling. _________________________
____ 88. The unit associated with amplitude is the hertz. _________________________
____ 89. Sound waves travel at different speeds in different mediums. _________________________
____ 90. Constructive interference occurs when the amplitudes of two waves combine to produce a wave with a smaller amplitude. _________________________
____ 91. The waves produced by earthquakes are known as seismic waves. _________________________
____ 92. The speed of sound in air decreases with increasing temperature. _________________________
____ 93. Interference occurs when two or more sound waves interact. _________________________
____ 94. It is not safe to put objects into your ear, even to clean it, because you may puncture the eardrum. _________________________
____ 95. Electromagnetic waves with the longest wavelengths have the highest frequencies. _________________________
____ 96. Electromagnetic waves that have wavelengths slightly shorter than those of visible light are called ultraviolet rays. _________________________