A-LevelPhysicsWavesMay/June 2017Paper 1 Q251 Mark
An ambulance travels along a straight road at a speed of 30.0 ms⁻¹. Its siren emits sound of frequency 2000 Hz. The speed of sound in the air is 340 ms⁻¹. The ambulance passes a man standing at the side of the road. What is the frequency of the sound heard by the man as the ambulance moves towards him and as the ambulance moves away from him? [Table with columns: frequency heard as ambulance moves towards man/Hz, frequency heard as ambulance moves away from man/Hz. Rows for A, B, C, D show different values.]
Atowards: 1820, away: 2180
Btowards: 1840, away: 2190
Ctowards: 2180, away: 1820
Dtowards: 2190, away: 1840
✓ Correct Answer
The correct answer is D: towards: 2190, away: 1840
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep