GCSE Physics resources

AQA GCSE Waves

Waves Required Practical

Measure frequency and wavelength using a ripple tank, string or sound setup, then calculate speed. Repeat measurements, use a clear scale and explain how reflections or parallax could affect the result.

AQA 8463AQA 8464 GCSE PhysicsCombined Science: Trilogy FoundationHigher

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The revision snapshot

Measure frequency and wavelength using a ripple tank, string or sound setup, then calculate speed. Repeat measurements, use a clear scale and explain how reflections or parallax could affect the result.

By the end, you should be able to:

  • Measure wave speed.
  • Apply the waves model, evidence or method to an unfamiliar exam context.
  • Recognise and correct this wrong turn: Measuring half a wavelength.

Before you revise

Diagnostic question

Choose an answer from memory. Your result tells you what to watch for in the guide.

Which statement correctly summarises waves required practical?

Core revision guide

Learn the model, then use it

Waves Required Practical questions become manageable when the central model, evidence and exam method are kept together. Read the explanation, test the misconception and then apply the idea without looking back.

Measure wave speed

Measure frequency and wavelength using a ripple tank, string or sound setup, then calculate speed. Repeat measurements, use a clear scale and explain how reflections or parallax could affect the result.

Build the physics picture

Find wavelength by measuring several waves and dividing, rather than using one small gap. Measure frequency from the generator or a timed count, then calculate v = f lambda. Control tension or water depth where they could change wave speed and repeat measurements to reduce random variation.

The relationship for this guide

Wave speed: v = fλ (m/s, Hz, m). Choose each relationship from the physical change described, convert quantities into compatible units and keep the unit beside the final answer.

A ripple tank has a lamp, dipper, straight wavefronts, screen and ruler measuring several wavelengths.
Measure several wave spacings and divide, then combine wavelength with the measured frequency.Open the full-size exam diagram
Wave speedv = fλm/s, Hz, m

Misconception clinic

Replace the tempting answer

Read each belief, say what is wrong with it, then compare your correction.

Tempting idea: Measuring half a wavelength.

Use instead: Measure frequency and wavelength using a ripple tank, string or sound setup, then calculate speed. Repeat measurements, use a clear scale and explain how reflections or parallax could affect the result.

Tempting idea: Forgetting units in v = fλ.

Use instead: Find wavelength by measuring several waves and dividing, rather than using one small gap. Measure frequency from the generator or a timed count, then calculate v = f lambda. Control tension or water depth where they could change wave speed and repeat measurements to reduce random variation.

Tempting idea: Changing water depth/tension during comparisons.

Use instead: State the apparatus, measurements, equation, control variables, repeats and one improvement linked to a named error.

Retrieval practice

Quick checks

1. Which exam method is most reliable for waves required practical?

2. Which statement correctly applies waves required practical to a question?

3. A pupil writes: “Measuring half a wavelength.” Which replacement is accurate?

Worked examples

See the method being built

These examples expose the difference between a secure measure wave speed method and the common error “Measuring half a wavelength.”.

Example 1 · Several wavelengths

Five wavelengths on a string occupy 2.0 m. Find wavelength.

  1. Measure several cycles.
  2. Divide total length by 5.
  3. Give metres.
Show the answer

λ = 2.0 ÷ 5 = 0.40 m.

Example 2 · Calculate speed

Frequency is 8.0 Hz and wavelength 0.40 m. Find speed.

  1. Use v = fλ.
  2. 8.0 × 0.40.
  3. Give m/s.
Show the answer

v = 3.2 m/s.

Example 3 · Improve measurement

A student measures one crest gap with a ruler. Improve method.

  1. Identify small-distance uncertainty.
  2. Measure many waves.
  3. Divide by number.
Show the answer

Measure across several wavelengths and divide, reducing percentage uncertainty.

Exam precision

Exam technique: Measure wave speed

Do this: State the apparatus, measurements, equation, control variables, repeats and one improvement linked to a named error.

Independent practice

Exam-style questions

Write an answer before opening the marking guidance. Then edit the exact phrase or step that would gain the next mark.

1. State the equation used in the waves practical.

[1 mark]
Show marking guidance and model answer

Marking guidance: Award one mark for the precise statement shown in the model answer.

Model answer: v = fλ.

2. State one way to measure frequency.

[1 mark]
Show marking guidance and model answer

Marking guidance: Award one mark for the precise statement shown in the model answer.

Model answer: Use signal generator setting or count waves in a known time.

3. State one control variable for waves on a string.

[1 mark]
Show marking guidance and model answer

Marking guidance: Award one mark for the precise statement shown in the model answer.

Model answer: Tension in the string.

4. Why repeat wavelength measurements?

[2 marks]
Show marking guidance and model answer

Marking guidance: 2 marks are available for relevant, linked physics points that match the model answer.

Model answer: To reduce random uncertainty and identify anomalies.

5. A wave has v = 12 m/s and f = 3.0 Hz. Find λ.

[3 marks]
Show marking guidance and model answer

Marking guidance: Award one mark for the correct relationship, one for a valid substitution and one for the final answer with its unit.

Model answer: λ = 12 ÷ 3.0 = 4.0 m.

6. Give one source of uncertainty and linked improvement.

[1 mark]
Show marking guidance and model answer

Marking guidance: Award one mark for the precise statement shown in the model answer.

Model answer: Parallax reading a ruler; view scale at right angles or use a fixed marker.

Questions pupils ask

Waves Required Practical FAQs

What is the main idea in Waves Required Practical?

Measure frequency and wavelength using a ripple tank, string or sound setup, then calculate speed. Repeat measurements, use a clear scale and explain how reflections or parallax could affect the result.

What mistake should I avoid in Waves Required Practical?

Measuring half a wavelength. Find wavelength by measuring several waves and dividing, rather than using one small gap. Measure frequency from the generator or a timed count, then calculate v = f lambda. Control tension or water depth where they could change wave speed and repeat measurements to reduce random variation.

Useful next steps

Connect this guide to your next task

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