Overview

This is lesson 3 of 7 in the unit "Waves: Sound and Light" designed for KS2 and KS3 students (ages 9-14). The lesson focuses on understanding how wave length and frequency affect wave properties through practical, engaging activities aligned with the National Curriculum for England (Science, KS2 & KS3).

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National Curriculum Links

KS2:

• Science – Physics:
  Pupil can describe patterns in sounds, such as pitch and volume.
  Pupils are introduced to the concept of waves (sounds and light), recognising the link between wave properties and their effects.

KS3:

• Physics – Waves:
  P3 Waves: Understand that waves transfer energy from one place to another.
  P4 Waves: Explain how changing wavelength and frequency affect properties of sound and light waves.
  P5 Waves: Use practical activities to observe wave behaviour with mathematical concepts of frequency and wavelength.

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WALT (We Are Learning To)

• Understand what wave length and frequency mean.
• Investigate experimentally how changing wave length and frequency affects wave characteristics.
• Describe differences in pitch and speed of sound waves using appropriate vocabulary.

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Success Criteria

• I can define wavelength and frequency in my own words.
• I can show how changing the distance between wave crests changes the wave behavior.
• I can explain the effect of wavelength and frequency on sound pitch and wave appearance using scientific terminology (crest, trough, frequency).
• I can record and interpret observations from the practical activity.

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Resources

• Slinkies or long springs (one per pair)
• Stopwatches
• Whiteboards and markers (including coloured pens)
• Posters with wave vocabulary and definitions (dyslexia-friendly fonts, e.g., Sassoon Primary)
• Visual timers for task timing
• Worksheet with guided questions (with optional dyslexia-friendly format)
• Noise-cancelling headphones (optional, for sensory regulation)

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Lesson Structure (30 minutes)

1. Introduction (5 minutes)

• Engage: Recall last lesson (what are waves? What do sound and light waves do?).
• Present the key vocabulary: wavelength, frequency, crest, trough. Use large dyslexia-friendly cards and clear diagrams with colour coding.
• Use a simple analogy: compare waves to people doing “the wave” in a stadium where “wavelength” = distance between people doing the wave, “frequency” = how often the wave happens.

Differentiation: Use clear visual and verbal explanations; have a peer “act out” waves sitting and standing in sequence.

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2. Practical Activity (15 minutes)

• Instructions:
  Students work in pairs (4 pairs) with slinkies to create transverse waves.
  • First, stretch the slinky moderately. One student creates slow pulses (large wavelength, low frequency) and the other times the pulses.
  • Next, create faster pulses (short wavelength, high frequency).
  • Observe the change in wave appearance and timing.
• Ask students to:
  • Measure the time for 5 waves for each pulse type (calculate frequency).
  • Observe and sketch the wave shape and mark crests and troughs on whiteboards.
• Group discussion: How does changing pulse speed affect wavelength and frequency? Which wave looks longer? Which is quicker?

Differentiation: Provide sentence starters for recording observations. Use paired discussions for learners needing social support.

Support: Break tasks into small, clear steps. Provide noise-cancelling headphones and regular breaks for students with sensory needs.

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3. Class Discussion & Extension (8 minutes)

• Recap what was observed.
• Introduce the link between frequency and pitch (higher frequency = higher pitch). Demonstrate by clapping rhythms or using a tone generator app (simple and visual).
• Extension for advanced learners: Calculate frequency using formula frequency = number of waves / time, and explore how frequency relates to energy transfer.
• Dyslexia-friendly recap sheet handed out summarising key terms with visuals.

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4. Plenary (2 minutes)

• Quick quiz: Hold up images of waves, ask students to say if wavelength is long or short and frequency high or low.
• Ask students to rate their confidence with the success criteria (thumbs up/middle/down).
• Highlight that next lesson will explore how waves transfer energy.

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Differentiation Strategies

Learner Need	Strategy
Dyslexia	Use dyslexia-friendly fonts, colour-coded visuals, simplified text, peer support, audio instructions.
Autism	Provide structure with clear step-by-step instructions, visual timers, controlled sensory environment.
ADHD	Use kinaesthetic activities, mini-breaks, clear focus signals, task variety.
FASD	Repeat instructions, clear and concise explanations, visual aids, small group support.
ODD	Offer choices in activity roles, positive reinforcement, set clear and consistent boundaries.

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Assessment

• Formative: Observation of participation and understanding during practical (noting ability to define wavelength/frequency, accurate sketching).
• Questioning throughout the lesson to check vocabulary understanding and conceptual grasp.
• Student self-assessment with confidence thumbs in plenary.

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Extension Activities for Advanced Learners

• Investigate how different mediums affect wave speed using a ripple tank or simulations (teacher-led).
• Calculate actual frequency from stopwatch data and pulse counts.
• Explore electromagnetic waves briefly by comparing light wave frequency and wavelength.

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This lesson not only meets the expectations set out in the National Curriculum for KS2 and KS3 science but also supports diverse learning needs while encouraging curiosity through practical inquiry.