Keep the wave quantities separate
Use the wave equation v = fλ and label amplitude, wavelength, frequency and direction. A change in frequency at a fixed speed changes wavelength, while amplitude describes energy transfer rather than spacing.
GCSE Physics resources
AQA GCSE Waves
Wave Properties, Speed, Frequency and Wavelength
Use the wave equation v = fλ and label amplitude, wavelength, frequency and direction. A change in frequency at a fixed speed changes wavelength, while amplitude describes energy transfer rather than spacing.
Start here
The quick revision snapshot
Use the wave equation v = fλ and label amplitude, wavelength, frequency and direction. A change in frequency at a fixed speed changes wavelength, while amplitude describes energy transfer rather than spacing.
By the end, you should be able to…
- Explain keep the wave quantities separate using precise physics language.
- Apply the relevant equations, diagrams or practical method to an exam-style situation.
- Use the mini quizzes and practice answers to identify and correct a misconception.
Core learning content
Learn the idea before you practise it
Start with this short teaching sequence for Wave Properties, Speed, Frequency and Wavelength. Read the model, use the visual, then test your recall before moving into examples and exam practice.
Build the picture
Wavelength is the distance between two matching points, such as adjacent crests; frequency is the number of waves each second. For a fixed wave speed, higher frequency means shorter wavelength. Amplitude is a maximum displacement and relates to energy transfer, not speed.
Use the right relationship
Choose a relationship because of the physical change in the question, not because it is familiar. Wave speed: v = fλ (m/s, Hz, m). Period: T = 1 ÷ f (s, Hz). Magnification: magnification = image height ÷ object height (no unit). Keep the unit next to each value while you substitute.
What a strong answer does
Read the diagram, convert units, choose v = fλ and use the wording in the question to describe the physical change. Before writing, underline the command word and identify the information that matters. Keep a calculation as equation, substitution and answer with unit; keep an explanation as a linked chain using because, so or therefore. Finish by checking that the final sentence answers the exact context in the question and that the number, direction or conclusion agrees with the evidence given.
Retrieval practice
Quick checks
Answer without looking back first. The feedback explains the model, so a wrong answer still helps you learn.
Mini quiz 1
Check the core idea
Mini quiz 2
Apply the model
Mini quiz 3
Use exam precision
Try it
Wave equation explorer
How do frequency and wavelength combine to determine wave speed?
What to notice: the readout and written explanation remain available if you do not use the controls.
Worked examples
See the method being built
Cover the answer, attempt the method and then compare your physics language as well as the number.
Example 1 · Wave equation
A wave has frequency 5.0 Hz and wavelength 0.80 m. Find speed.
- Use v = fλ.
- Multiply 5.0 × 0.80.
- Give m/s.
Show the answer
v = 4.0 m/s.
Example 2 · Find wavelength
A wave speed is 340 m/s and frequency 170 Hz. Find wavelength.
- Rearrange λ = v/f.
- 340 ÷ 170.
- Give metres.
Show the answer
λ = 2.0 m.
Example 3 · Amplitude meaning
Two waves have same frequency but one larger amplitude. State the difference.
- Keep frequency unchanged.
- Identify displacement.
- Link amplitude to energy transfer.
Show the answer
The larger-amplitude wave has greater maximum displacement and typically transfers more energy.
Misconception clinic
Common wrong turns
Each of these is tempting because it sounds almost right. Replace it with the precise physics before you meet it in a question.
- Measuring wavelength crest to trough.
- Using amplitude as wave speed.
- Mixing Hz and seconds.
Independent practice
Exam-style questions
Use the working space first. Reveal the guidance only after you have committed to an answer, then improve the exact part that would gain the next mark.
1. Define wavelength.
[2 marks]Show answer and marking guidance
Distance between two adjacent points in phase, such as crest to crest.
2. Define frequency.
[2 marks]Show answer and marking guidance
Number of complete waves passing a point each second.
3. State the unit of frequency.
[1 mark]Show answer and marking guidance
Hertz, Hz.
4. A 12 Hz wave has wavelength 0.50 m. Find speed.
[2 marks]Show answer and marking guidance
v = 12 × 0.50 = 6.0 m/s.
5. Explain what amplitude measures.
[3 marks]Show answer and marking guidance
Maximum displacement from the equilibrium position.
6. If speed stays constant and frequency doubles, state what happens to wavelength.
[2 marks]Show answer and marking guidance
It halves.
Questions pupils ask
GCSE Physics FAQs
What is the key idea in Wave Properties, Speed, Frequency and Wavelength?
A wave transfers energy without transferring matter overall. Use diagrams to keep amplitude, wavelength, frequency, speed and direction distinct.
How should I practise Wave Properties, Speed, Frequency and Wavelength?
Read the snapshot, attempt the worked examples without looking, complete the mini quizzes and then use the practice questions to check your wording and method.
Next step
Keep your revision moving
Physics sticks when you move between explanation, retrieval and application.