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Progressive and stationary waves
Study Progressive and stationary waves as part of Waves for AQA A-Level Physics 7408. This topic hub connects the approved learning objectives to flashcards, MCQs, exam-style questions, answer explanations, revision notes, key terms, common mistakes, exam tips, and mini practice tests where those assets are published. Use the overview to separate definitions, equations, data analysis, graph interpretation, practical reasoning, and conceptual explanations before moving into the practice tools. For Progressive and stationary waves, pay close attention to units, assumptions, evidence and boundary distinctions so answers stay specific to the exact A-Level Physics context.
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90 min
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Syllabus checklist
What you need to know
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Progressive waves4 objectives
- Define wavelength, frequency, period, amplitude and phase.
- Use wave speed equations in progressive wave calculations.
- Interpret displacement-time and displacement-distance graphs.
- Describe energy transfer by progressive waves.
Longitudinal and transverse waves4 objectives
- Distinguish longitudinal waves from transverse waves.
- Describe compressions and rarefactions in longitudinal waves.
- Explain why polarisation is evidence for transverse waves.
- Apply wave-type distinctions to sound, light and waves on strings.
Superposition and stationary waves4 objectives
- State and apply the principle of superposition.
- Explain how stationary waves form from two progressive waves.
- Identify nodes, antinodes and harmonics on stationary wave diagrams.
- Required practical 1: investigate how string length, tension and mass per unit length affect stationary waves.
Key terms
Exam tips
- Understanding Wave Properties: Remember the definitions of wavelength, frequency, period, amplitude, and phase. Use the formula for wave speed: v = f × λ, where v is wave speed, f is frequency, and λ is wavelength.
- Wave Speed Calculation Tip: To calculate the speed of a wave, use the formula: wave speed (v) = frequency (f) × wavelength (λ).
Common mistakes
- Confusing Wavelength and Frequency: Remember that wavelength (λ) is the distance between successive crests of a wave, while frequency (f) is the number of waves that pass a point in one second. Use the wave speed equation: v = f × λ. For example, if the wave speed is 340 m/s and the frequency is 170 Hz, then λ = v / f = 340 m/s / 170 Hz = 2 m. Thus, the wavelength is 2 meters.
- Misunderstanding Wave Speed Calculation: To calculate wave speed, use the formula v = f × λ, where v is wave speed (m/s), f is frequency (Hz), and λ is wavelength (m). Ensure all units are in SI units before substituting values.
Practice preview
- Which statement gives the clearest definition needed for Define Wavelength Frequency Period Amplitude And Phase?
- A student makes a mistake while revising Define Wavelength Frequency Period Amplitude And Phase. Which correction is most accurate?
- Which response best uses evidence or a diagram feature to support Define Wavelength Frequency Period Amplitude And Phase?
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