A-LevelPhysicsAlternating currentsOct/Nov 2017Paper 4 Q58 Marks
The analogue signal from a microphone is to be transmitted in digital form. The variation with time t of part of the signal from the microphone is shown in Fig. 5.1. [Figure 5.1] The microphone output is sampled at a frequency of 5.0 kHz by an analogue-to-digital converter (ADC). The output from the ADC is a series of 4-bit numbers. The smallest bit represents 1.0mV. The first sample is taken at time t = 0.
📋 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.
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