A-LevelPhysicsWavesFeb/Mar 2022Paper 1 Q221 Mark
The warning signal on an ambulance has a frequency of 600 Hz. The speed of sound is 330 ms⁻¹. The ambulance is travelling with a constant velocity of 25 ms⁻¹ towards an observer. The ambulance passes, and then moves away from the observer with no change in velocity. [Figure 22.1] Which overall change in observed frequency takes place between the times at which the ambulance is a long way behind the observer and when it is a long way in front of the observer?
A49 Hz
B84 Hz
C91 Hz
D98 Hz
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of waves within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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