ScienceAges 7-9

Sound, pitch & vibrations

Explore how vibrations produce sound waves, how pitch and volume change, and how sound travels through media. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 7-9

Sound, pitch & vibrations

Take your time. Show your thinking.

1. How are all sounds produced: by objects vibrating back and forth, or by objects standing completely still?
Amplitude (Loudness) · Frequency (Pitch)
2. What unit is used in science to measure the frequency of a sound wave (the number of vibrations per second): hertz (Hz) or newtons (N)?
Amplitude (Loudness) · Frequency (Pitch)
3. How does sound travel from a ringing bell to your ear: vibrations pass from particle to particle through the air as a sound wave, or tiny pieces of metal fly into your ear?
Amplitude (Loudness) · Frequency (Pitch)
4. Why does a sound become quieter the further away you move from the source: the sound energy spreads out over a larger and larger sphere of air, or the pitch drops to zero?
Amplitude (Loudness) · Frequency (Pitch)
5. When you pluck a stretched rubber band or guitar string, what do you see and hear: the string vibrates rapidly and makes a sound, or the string turns into liquid?
Amplitude (Loudness) · Frequency (Pitch)
6. When a guitarist tightens a guitar string to increase its tension, what happens to the pitch of the note: the pitch becomes higher, or the string stops vibrating?
Amplitude (Loudness) · Frequency (Pitch)
7. What is the approximate frequency range of normal human hearing in young people: 20 Hz to 20,000 Hz, or 1 Hz to 5 Hz?
Amplitude (Loudness) · Frequency (Pitch)
8. Which thin stretched membrane inside the human ear vibrates when sound waves reach it down the ear canal: the eardrum (tympanic membrane) or the retina?
Amplitude (Loudness) · Frequency (Pitch)
9. Why are cinema walls and recording studios lined with soft foam, curtains and carpets: soft, porous materials absorb sound waves to prevent echoes, or soft foam makes sounds louder?
Amplitude (Loudness) · Frequency (Pitch)
10. On a xylophone or panpipe, which bar or pipe produces the HIGHEST pitch when struck: the shortest bar/pipe (which vibrates fastest), or the longest bar/pipe?
Amplitude (Loudness) · Frequency (Pitch)
11. How do bats and dolphins use echolocation (sonar) to find prey in the dark or deep water: they emit high-pitched clicks and time how long the echoes take to bounce back, or they use magnets?
Amplitude (Loudness) · Frequency (Pitch)
12. What word describes how loud or quiet a sound is: volume (loudness) or pitch?
Amplitude (Loudness) · Frequency (Pitch)

12 questions · Seed 56 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 7-9

Sound, pitch & vibrations

Answers and reasoning. Review before teaching.

1. How are all sounds produced: by objects vibrating back and forth, or by objects standing completely still?
By objects vibrating back and forth
Every sound source—such as a plucked guitar string, a drum skin or your vocal cords—vibrates.
2. What unit is used in science to measure the frequency of a sound wave (the number of vibrations per second): hertz (Hz) or newtons (N)?
Hertz (Hz)
1 hertz (1 Hz) equals 1 complete vibration (cycle) per second.
3. How does sound travel from a ringing bell to your ear: vibrations pass from particle to particle through the air as a sound wave, or tiny pieces of metal fly into your ear?
Vibrations pass from particle to particle through the air as a sound wave
Sound is a longitudinal mechanical wave of compressions and rarefactions travelling through air particles.
4. Why does a sound become quieter the further away you move from the source: the sound energy spreads out over a larger and larger sphere of air, or the pitch drops to zero?
The sound energy spreads out over a larger and larger sphere of air
As distance from the source increases, the wave energy is spread over a bigger area, so amplitude decreases.
5. When you pluck a stretched rubber band or guitar string, what do you see and hear: the string vibrates rapidly and makes a sound, or the string turns into liquid?
The string vibrates rapidly and makes a sound
Stopping the vibration of the string immediately stops the sound.
6. When a guitarist tightens a guitar string to increase its tension, what happens to the pitch of the note: the pitch becomes higher, or the string stops vibrating?
The pitch becomes higher
A tighter string vibrates faster when plucked, raising the pitch.
7. What is the approximate frequency range of normal human hearing in young people: 20 Hz to 20,000 Hz, or 1 Hz to 5 Hz?
20 Hz to 20,000 Hz
Humans typically hear frequencies from about 20 Hz (deep bass) up to 20,000 Hz (20 kHz).
8. Which thin stretched membrane inside the human ear vibrates when sound waves reach it down the ear canal: the eardrum (tympanic membrane) or the retina?
Eardrum (tympanic membrane)
Sound waves cause the eardrum to vibrate, passing vibrations to the three tiny middle-ear bones (ossicles).
9. Why are cinema walls and recording studios lined with soft foam, curtains and carpets: soft, porous materials absorb sound waves to prevent echoes, or soft foam makes sounds louder?
Soft, porous materials absorb sound waves to prevent echoes
Soft materials trap air and convert sound energy into tiny amounts of heat, reducing reverberation.
10. On a xylophone or panpipe, which bar or pipe produces the HIGHEST pitch when struck: the shortest bar/pipe (which vibrates fastest), or the longest bar/pipe?
The shortest bar/pipe (which vibrates fastest)
Shorter, smaller columns or bars vibrate at a higher frequency, giving a higher pitch.
11. How do bats and dolphins use echolocation (sonar) to find prey in the dark or deep water: they emit high-pitched clicks and time how long the echoes take to bounce back, or they use magnets?
They emit high-pitched clicks and time how long the echoes take to bounce back
The time delay and direction of returning echoes reveal the distance and location of objects.
12. What word describes how loud or quiet a sound is: volume (loudness) or pitch?
Volume (loudness)
Volume depends on the amplitude (size) of the vibrations.

12 questions · Seed 56 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 7-9

Sound, pitch & vibrations

Take your time. Show your thinking.

1. How are all sounds produced: by objects vibrating back and forth, or by objects standing completely still?
Amplitude (Loudness) · Frequency (Pitch)
2. What unit is used in science to measure the frequency of a sound wave (the number of vibrations per second): hertz (Hz) or newtons (N)?
Amplitude (Loudness) · Frequency (Pitch)
3. How does sound travel from a ringing bell to your ear: vibrations pass from particle to particle through the air as a sound wave, or tiny pieces of metal fly into your ear?
Amplitude (Loudness) · Frequency (Pitch)
4. Why does a sound become quieter the further away you move from the source: the sound energy spreads out over a larger and larger sphere of air, or the pitch drops to zero?
Amplitude (Loudness) · Frequency (Pitch)
5. When you pluck a stretched rubber band or guitar string, what do you see and hear: the string vibrates rapidly and makes a sound, or the string turns into liquid?
Amplitude (Loudness) · Frequency (Pitch)
6. When a guitarist tightens a guitar string to increase its tension, what happens to the pitch of the note: the pitch becomes higher, or the string stops vibrating?
Amplitude (Loudness) · Frequency (Pitch)
7. What is the approximate frequency range of normal human hearing in young people: 20 Hz to 20,000 Hz, or 1 Hz to 5 Hz?
Amplitude (Loudness) · Frequency (Pitch)
8. Which thin stretched membrane inside the human ear vibrates when sound waves reach it down the ear canal: the eardrum (tympanic membrane) or the retina?
Amplitude (Loudness) · Frequency (Pitch)
9. Why are cinema walls and recording studios lined with soft foam, curtains and carpets: soft, porous materials absorb sound waves to prevent echoes, or soft foam makes sounds louder?
Amplitude (Loudness) · Frequency (Pitch)
10. On a xylophone or panpipe, which bar or pipe produces the HIGHEST pitch when struck: the shortest bar/pipe (which vibrates fastest), or the longest bar/pipe?
Amplitude (Loudness) · Frequency (Pitch)
11. How do bats and dolphins use echolocation (sonar) to find prey in the dark or deep water: they emit high-pitched clicks and time how long the echoes take to bounce back, or they use magnets?
Amplitude (Loudness) · Frequency (Pitch)
12. What word describes how loud or quiet a sound is: volume (loudness) or pitch?
Amplitude (Loudness) · Frequency (Pitch)

12 questions · Seed 56 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 7-9

Sound, pitch & vibrations

Answers and reasoning. Review before teaching.

1. How are all sounds produced: by objects vibrating back and forth, or by objects standing completely still?
By objects vibrating back and forth
Every sound source—such as a plucked guitar string, a drum skin or your vocal cords—vibrates.
2. What unit is used in science to measure the frequency of a sound wave (the number of vibrations per second): hertz (Hz) or newtons (N)?
Hertz (Hz)
1 hertz (1 Hz) equals 1 complete vibration (cycle) per second.
3. How does sound travel from a ringing bell to your ear: vibrations pass from particle to particle through the air as a sound wave, or tiny pieces of metal fly into your ear?
Vibrations pass from particle to particle through the air as a sound wave
Sound is a longitudinal mechanical wave of compressions and rarefactions travelling through air particles.
4. Why does a sound become quieter the further away you move from the source: the sound energy spreads out over a larger and larger sphere of air, or the pitch drops to zero?
The sound energy spreads out over a larger and larger sphere of air
As distance from the source increases, the wave energy is spread over a bigger area, so amplitude decreases.
5. When you pluck a stretched rubber band or guitar string, what do you see and hear: the string vibrates rapidly and makes a sound, or the string turns into liquid?
The string vibrates rapidly and makes a sound
Stopping the vibration of the string immediately stops the sound.
6. When a guitarist tightens a guitar string to increase its tension, what happens to the pitch of the note: the pitch becomes higher, or the string stops vibrating?
The pitch becomes higher
A tighter string vibrates faster when plucked, raising the pitch.
7. What is the approximate frequency range of normal human hearing in young people: 20 Hz to 20,000 Hz, or 1 Hz to 5 Hz?
20 Hz to 20,000 Hz
Humans typically hear frequencies from about 20 Hz (deep bass) up to 20,000 Hz (20 kHz).
8. Which thin stretched membrane inside the human ear vibrates when sound waves reach it down the ear canal: the eardrum (tympanic membrane) or the retina?
Eardrum (tympanic membrane)
Sound waves cause the eardrum to vibrate, passing vibrations to the three tiny middle-ear bones (ossicles).
9. Why are cinema walls and recording studios lined with soft foam, curtains and carpets: soft, porous materials absorb sound waves to prevent echoes, or soft foam makes sounds louder?
Soft, porous materials absorb sound waves to prevent echoes
Soft materials trap air and convert sound energy into tiny amounts of heat, reducing reverberation.
10. On a xylophone or panpipe, which bar or pipe produces the HIGHEST pitch when struck: the shortest bar/pipe (which vibrates fastest), or the longest bar/pipe?
The shortest bar/pipe (which vibrates fastest)
Shorter, smaller columns or bars vibrate at a higher frequency, giving a higher pitch.
11. How do bats and dolphins use echolocation (sonar) to find prey in the dark or deep water: they emit high-pitched clicks and time how long the echoes take to bounce back, or they use magnets?
They emit high-pitched clicks and time how long the echoes take to bounce back
The time delay and direction of returning echoes reveal the distance and location of objects.
12. What word describes how loud or quiet a sound is: volume (loudness) or pitch?
Volume (loudness)
Volume depends on the amplitude (size) of the vibrations.

12 questions · Seed 56 · Age guidance, not curriculum certification