6.2 Waves: How do we use the waves around us?
Explain reflection, refraction, absorption and transmission and evaluate applications across the spectrum.
How to study WJEC GCSE The Sciences
Move from a scientific model to a prediction or method, collect or interpret evidence, show quantitative working and finish with a conclusion whose limits match the data.
Core concepts
Concept 1
Trace rays and explain colour using absorption and reflection.
Exam cue: Identify the unit, entered tier, supplied reference material, command word and relevant scientific enquiry skill.
Concept 2
Apply refraction and total internal reflection to devices.
Exam cue: Name the boundary interaction and use the wave's frequency, penetration or energy to justify an application.
Concept 3
Select waves for communication, imaging or treatment from their properties.
Exam cue: Use scientific terminology, show quantitative working with units, and connect conclusions to data and the stated model.
Concept 4
Official subtopics: 6.2.1 Reflection, refraction, absorption and transmission of waves; 6.2.2 Using waves.
Concept 5
Scientific enquiry and mathematical skills apply in this topic; bold amplification is Higher Tier only.
Risk pitfalls and guardrails
Saying a wave bends because its frequency changes at the boundary.
Guardrail: Do not import outgoing 3430QD content, another science route, a fixed required-practical list or unsupported tier and connection assumptions.
Recalling a fact without applying it to the observation, data, practical method or unfamiliar context.
Guardrail: Use the live secure pack: Task A may use groups of up to three; Task B is individual and highly controlled. Two enquiries are selected by the centre from three.
Importing content, required practicals, tier rules or paper structure from the outgoing WJEC or another awarding-body route.
Guardrail: Bold amplification is Higher-only. Units 1-6 may mix tiers, but Unit 7 is untiered.
Memory anchors
Reflection
Change in direction when a wave returns from a boundary.
Refraction
Change in direction caused by a speed change between media.
Absorption
Transfer of wave energy into a material.
Transmission
Passage of a wave through a material or boundary.
Total internal reflection
Complete reflection inside a material beyond the critical angle.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Why can ultrasound be useful for imaging inside the body? Trace reflection, refraction, absorption or transmission through the stated device. Check each causal step before deciding.
A ray strikes a mirror at 35° to the normal. What is the reflection angle? Trace reflection, refraction, absorption or transmission through the stated device. Treat every stated unit as part of the evidence.
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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