Sound — Difficult
Transfer your understanding to a changed context, justify decisions and check your reasoning. No hints during the test.
Includes extension practice
Sound, echoes and the ultrasound frequency boundary are included. Detailed ultrasound scanning, non-destructive testing and sonar-depth tasks extend the stated requirements.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- Cambridge IGCSE Co-ordinated Sciences 0654 syllabus 2028–2029 · P3.4, pp66–67
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