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Cutoff frequency of RC low-pass filter:
ARC²
BRC
Cf_c = 1/(2πRC)
DR/C
Answer & Solution
Correct answer: C. f_c = 1/(2πRC)
Single-pole RC LP: f_c = 1/(2πRC). At f_c, output attenuates -3 dB (half power). Roll-off: -20 dB/decade beyond. Phase: -45° at f_c, approaches -90° at high f. High-pass: just swap R and C, same f_c formula.
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