A-LevelPhysicsWavesOct/Nov 2020Paper 1 Q251 Mark
An emergency vehicle sounds its siren as it accelerates along a straight road between two points X and Y, as shown in the diagram. [Figure 25.1] The frequency of the sound emitted by the siren is 750 Hz. A person stands at X and another person stands at Y. What describes the sounds heard by the people at X and at Y as the vehicle accelerates?
Asound heard by person at X: higher than 750 Hz, increasing in frequency; sound heard by person at Y: lower than 750 Hz, decreasing in frequency
Bsound heard by person at X: higher than 750 Hz, decreasing in frequency; sound heard by person at Y: lower than 750 Hz, increasing in frequency
Csound heard by person at X: lower than 750 Hz, decreasing in frequency; sound heard by person at Y: higher than 750 Hz, increasing in frequency
Dsound heard by person at X: lower than 750 Hz, increasing in frequency; sound heard by person at Y: higher than 750 Hz, decreasing in frequency
✓ 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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