Physics 7408/3BE June 2020

The AQA A-level Physics Paper 3B (November 2020), Option E (Electronics), delves into digital systems, communication circuits, and signal processing. Topics include 4-bit binary counters, Boolean algebra, prime number logic systems, and truth tables. Questions explore filter circuits for amplitude modulation, resonance frequencies, and Q factor calculations. The paper assesses understanding of pulse code modulation, sampling frequency, digital audio storage, and its impact on music quality. Additionally, students evaluate optical vs. copper cables in data transmission. Keywords: AQA Physics, electronics, binary counter, Boolean algebra, AM radio, Q factor, PCM, fiber optics, digital communication.