(Physics only) Define ultrasound as sound with frequency above the upper limit of human hearing.

(Physics only) Define ultrasound as sound with frequency above the upper limit of human hearing.. Within Waves in air, fluids and solids, this learning objective sits inside Waves for detection and exploration (physics only) for AQA Physics 8463. Focus on using ideas such as physics only, ultrasound accurately in your explanation. A strong response should define the core idea, describe the relevant physical process, and connect it back to the question wording instead of giving a vague definition. When revising, students should aim to explain the subject clearly, include precise physics vocabulary, and show how the idea links to the wider topic rather than listing isolated facts.