GCSE Physics Revision — Sound Waves
Revise Sound Waves for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), Pearson Edexcel International, OxfordAQA International, SQA, IB, AP.
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- Sound Waves in GCSE Physics: explanation, examples, and practice links on this page.
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What is Sound Waves?
Sound waves are longitudinal waves caused by vibrations. These vibrations travel through a medium (like air, water, or solids) as a series of compressions and rarefactions. The pitch of a sound is determined by its frequency, and the loudness is determined by its amplitude. Humans can typically hear sounds in the range of 20 Hz to 20,000 Hz.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The properties of sound and the difference between pitch and loudness are key concepts.
Step-by-step explanationWorked examples
Worked example 1: Core method
A ship uses sonar to measure the depth of the sea. It sends a sound pulse and receives the echo 1.2 seconds later. If the speed of sound in seawater is 1500 m/s, how deep is the sea? Solution: The sound travels to the seabed and back, so the time to reach the bottom is 1.2s / 2 = 0.6s. Distance = Speed x Time. Depth = 1500 m/s x 0.6s = 900m.
Worked example 2: Exam variation
Now change one detail in the question and keep the same structure: name the Sound Waves idea being tested, show the method or evidence, then explain why it answers the command word. This helps GCSE Physics students avoid memorising one surface pattern.
Worked example 3: Mark-scheme check
Finish by checking the answer against marks: one point for the correct Sound Waves idea, one for accurate working or evidence, and one for a precise final statement. If any step is vague, rewrite it before moving to timed practice.
Mini lesson for Sound Waves
1. Understand the core idea
Sound waves are longitudinal waves caused by vibrations. These vibrations travel through a medium (like air, water, or solids) as a series of compressions and rarefactions.
Can you explain Sound Waves without copying the notes?
2. Turn it into marks
A ship uses sonar to measure the depth of the sea. It sends a sound pulse and receives the echo 1.
Underline the method, evidence, or command-word move that would earn credit in GCSE Waves.
3. Fix the likely mark leak
Watch for this mistake: Thinking that sound can travel through a vacuum. Sound requires a medium to travel, as it is the vibration of particles.
Write one correction rule before doing another practice question.
Practise this topic
Start with low-focus cards for Sound Waves, then move into full exam-style practice when you want the heavier session.
Mini quiz: Sound Waves
Three quick checks for revision practice. They are original StudyVector prompts, not official exam-board questions.
Question 1
In one GCSE sentence, explain what Sound Waves is testing.
Answer: Sound waves are longitudinal waves caused by vibrations. These vibrations travel through a medium (like air, water, or solids) as a series of compressions and rarefactions.
Mark focus: Precise definition and topic focus.
Question 2
A Sound Waves question uses an unfamiliar context. What should the answer do before adding detail?
Answer: It should name the process, variable, equation, particle model, or evidence being tested, then explain the result using precise scientific vocabulary.
Mark focus: Method selection and command-word control.
Question 3
A student makes this mistake: "Thinking that sound can travel through a vacuum. Sound requires a medium to travel, as it is the vibration of particles." What should their next repair task be?
Answer: Do one Sound Waves question and review the mistake type.
Mark focus: Error correction and next-step practice.
Sound Waves flashcards
Core idea
What is the main idea in Sound Waves?
Sound waves are longitudinal waves caused by vibrations. These vibrations travel through a medium (like air, water, or solids) as a series of compressions and rarefactions.
Common mistake
What mistake should you avoid in Sound Waves?
Thinking that sound can travel through a vacuum. Sound requires a medium to travel, as it is the vibration of particles.
Practice
What is one useful practice task for Sound Waves?
Answer one Sound Waves question and review the mistake type.
Exam board
How should you use board notes for Sound Waves?
Covered by all major boards (AQA, Edexcel, OCR). The properties of sound and the difference between pitch and loudness are key concepts.
Common mistakes
- 1Thinking that sound can travel through a vacuum. Sound requires a medium to travel, as it is the vibration of particles.
- 2Confusing pitch with loudness. Pitch is related to frequency (high frequency = high pitch), while loudness is related to amplitude (large amplitude = loud sound).
- 3Forgetting that sound travels at different speeds in different materials. It travels fastest in solids, slower in liquids, and slowest in gases.
Sound Waves exam questions
Exam-style questions for Sound Waves with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), Pearson Edexcel International, OxfordAQA International, SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Sound Waves
Core concept
Sound waves are longitudinal waves caused by vibrations. These vibrations travel through a medium (like air, water, or solids) as a series of compressions and rarefactions. The pitch of a sound is det…
Frequently asked questions
What is an echo?
An echo is a reflection of a sound wave. When a sound wave hits a hard, flat surface, it bounces back, and you may hear it again shortly after the original sound.
What is ultrasound?
Ultrasound is sound with a frequency higher than the upper limit of human hearing (above 20,000 Hz). It has many applications, including medical imaging (prenatal scans) and industrial cleaning.