Practice worksheet on sound waves and pitch, including questions on wave properties and visual examples of sound vibrations.
A practice worksheet about sound waves, featuring fill-in-the-blank questions and multiple-choice questions with diagrams of waveforms and sound experiments.
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Show Answer Key & Explanations
Step-by-step solution for: Sound
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Show Answer Key & Explanations
Step-by-step solution for: Sound
Here’s the complete solution to the worksheet, with explanations for each answer:
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1. When waves are _faster_ the pitch goes up.
✔ Answer: faster
*Explanation:* Pitch is determined by frequency — how many wave cycles pass a point per second. Faster vibrations = higher frequency = higher pitch.
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2. When waves are _slower_ the pitch goes down.
✔ Answer: slower
*Explanation:* Slower vibrations mean lower frequency, which results in a lower pitch (like a deep bass note).
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3. When waves are _bigger_ the sound gets louder.
✔ Answer: bigger
*Explanation:* “Bigger” refers to amplitude — the height of the wave. Greater amplitude means more energy, which we perceive as louder sound.
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4. When waves are _smaller_ the sound gets quieter.
✔ Answer: smaller
*Explanation:* Smaller amplitude = less energy = quieter sound.
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5. Sound is created by _vibration(s)_ that cause _particle(s)_ to bump into each other, forming a _wave(s)_ that travels to your ear for you to hear.
✔ Answers: vibration(s), particle(s), wave(s)
*Explanation:* Sound starts with something vibrating (like vocal cords or a guitar string). This vibration pushes nearby air particles, which bump into neighboring particles — this chain reaction creates a sound wave that travels through air (or other mediums) until it reaches your eardrum.
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6. Which of these is louder?
✔ Answer: B
*Explanation:* Loudness depends on amplitude (wave height). Wave B has a taller crest and deeper trough than Wave A → greater amplitude → louder sound.
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7. Which of these is higher pitch?
✔ Answer: B
*Explanation:* Higher pitch = higher frequency = more waves per unit time. Wave B has more cycles (peaks/troughs) in the same space than Wave A → higher frequency → higher pitch.
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8. Which of these has the lowest pitch?
✔ Answer: A
*Explanation:* This question shows water in glasses — when you tap them, the amount of water affects the pitch. More water = slower vibration = lower pitch. Glass A has the least water → vibrates fastest → highest pitch? Wait — actually, the opposite!
⚠️ Important Correction:
When you *tap* a glass with water, the water *dampens* the vibration. The more water, the lower the pitch because the system vibrates more slowly. So:
- Glass A (least water) → highest pitch
- Glass C (most water) → lowest pitch
✔ Correct Answer: C
*Explanation:* More water = heavier mass = slower vibration = lower frequency = lower pitch. So C has the lowest pitch.
*(Note: If you were blowing across the top of the glasses, the air column would make the opposite true — but since it’s not specified, and standard classroom experiments involve tapping, we assume tapping.)*
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9. Using words and/or pictures explain briefly how we hear sound.
✔ Sample Answer (in words):
Sound begins with a vibration (like from a drum or voice). This vibration moves air particles, creating a sound wave. The wave travels through the air to your ear, where it hits your eardrum and makes it vibrate. These vibrations travel through tiny bones in your middle ear to your inner ear (cochlea), where they are turned into electrical signals. Your brain receives these signals and interprets them as sound.
*(You could also draw arrows showing: source → air particles → eardrum → ossicles → cochlea → auditory nerve → brain.)*
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10. Write down one other thing you learned about sound from this lesson.
✔ Sample Answers (choose one):
- Sound needs a medium (like air, water, or solids) to travel — it can’t travel in a vacuum.
- Loudness is related to wave amplitude, and pitch is related to wave frequency.
- Different materials or amounts of water can change the pitch of a sound.
- Sound waves are longitudinal waves — particles move back and forth in the same direction the wave travels.
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✔ Final Answer Summary:
1. faster
2. slower
3. bigger
4. smaller
5. vibration(s), particle(s), wave(s)
6. B
7. B
8. C
9. [See explanation above]
10. [See sample answers above]
Let me know if you’d like a printable version or diagrams to go with this!
---
1. When waves are _faster_ the pitch goes up.
✔ Answer: faster
*Explanation:* Pitch is determined by frequency — how many wave cycles pass a point per second. Faster vibrations = higher frequency = higher pitch.
---
2. When waves are _slower_ the pitch goes down.
✔ Answer: slower
*Explanation:* Slower vibrations mean lower frequency, which results in a lower pitch (like a deep bass note).
---
3. When waves are _bigger_ the sound gets louder.
✔ Answer: bigger
*Explanation:* “Bigger” refers to amplitude — the height of the wave. Greater amplitude means more energy, which we perceive as louder sound.
---
4. When waves are _smaller_ the sound gets quieter.
✔ Answer: smaller
*Explanation:* Smaller amplitude = less energy = quieter sound.
---
5. Sound is created by _vibration(s)_ that cause _particle(s)_ to bump into each other, forming a _wave(s)_ that travels to your ear for you to hear.
✔ Answers: vibration(s), particle(s), wave(s)
*Explanation:* Sound starts with something vibrating (like vocal cords or a guitar string). This vibration pushes nearby air particles, which bump into neighboring particles — this chain reaction creates a sound wave that travels through air (or other mediums) until it reaches your eardrum.
---
6. Which of these is louder?
✔ Answer: B
*Explanation:* Loudness depends on amplitude (wave height). Wave B has a taller crest and deeper trough than Wave A → greater amplitude → louder sound.
---
7. Which of these is higher pitch?
✔ Answer: B
*Explanation:* Higher pitch = higher frequency = more waves per unit time. Wave B has more cycles (peaks/troughs) in the same space than Wave A → higher frequency → higher pitch.
---
8. Which of these has the lowest pitch?
✔ Answer: A
*Explanation:* This question shows water in glasses — when you tap them, the amount of water affects the pitch. More water = slower vibration = lower pitch. Glass A has the least water → vibrates fastest → highest pitch? Wait — actually, the opposite!
⚠️ Important Correction:
When you *tap* a glass with water, the water *dampens* the vibration. The more water, the lower the pitch because the system vibrates more slowly. So:
- Glass A (least water) → highest pitch
- Glass C (most water) → lowest pitch
✔ Correct Answer: C
*Explanation:* More water = heavier mass = slower vibration = lower frequency = lower pitch. So C has the lowest pitch.
*(Note: If you were blowing across the top of the glasses, the air column would make the opposite true — but since it’s not specified, and standard classroom experiments involve tapping, we assume tapping.)*
---
9. Using words and/or pictures explain briefly how we hear sound.
✔ Sample Answer (in words):
Sound begins with a vibration (like from a drum or voice). This vibration moves air particles, creating a sound wave. The wave travels through the air to your ear, where it hits your eardrum and makes it vibrate. These vibrations travel through tiny bones in your middle ear to your inner ear (cochlea), where they are turned into electrical signals. Your brain receives these signals and interprets them as sound.
*(You could also draw arrows showing: source → air particles → eardrum → ossicles → cochlea → auditory nerve → brain.)*
---
10. Write down one other thing you learned about sound from this lesson.
✔ Sample Answers (choose one):
- Sound needs a medium (like air, water, or solids) to travel — it can’t travel in a vacuum.
- Loudness is related to wave amplitude, and pitch is related to wave frequency.
- Different materials or amounts of water can change the pitch of a sound.
- Sound waves are longitudinal waves — particles move back and forth in the same direction the wave travels.
---
✔ Final Answer Summary:
1. faster
2. slower
3. bigger
4. smaller
5. vibration(s), particle(s), wave(s)
6. B
7. B
8. C
9. [See explanation above]
10. [See sample answers above]
Let me know if you’d like a printable version or diagrams to go with this!
Parent Tip: Review the logic above to help your child master the concept of sound wave worksheet.
