Contents
Independent final check
Explain without the key
identify / explain
Final check
A mosquito’s wings beat backwards and forwards about 500 times each second, and you hear a whine. (a) Which row is correct? (b) Supplement: explain why the air pressure at your ear rises and falls about 500 times each second.
identify: name or select. explain: give reasons and connect them to evidence.
| Row | What makes the whine | How an air particle between the mosquito and you moves | Type of wave |
|---|---|---|---|
| A | the wings push and pull the air | up and down, at right angles to the travel | transverse |
| B | air from the wings flows to your ear | along with the sound, all the way to you | longitudinal |
| C | the wings push and pull the air | backwards and forwards along the travel | longitudinal |
| D | the wings push and pull the air | backwards and forwards along the travel | transverse |
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Cambridge IGCSE Physics 0625 (2026–2028): 3.4.1–3.4.5, 3.4.7; Supplement 3.4.10–3.4.11. Echoes, ultrasound and measuring sound speed belong to the next module.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus