Discussion
Statement I: Thermal noise is white over the frequencies of interest in analogue communication.
Statement II: Flicker noise is white over the same range.
In the light of the above statements, choose the correct answer.
Answer: B
The first is true and the second is false: flicker noise rises as frequency falls, which is why it is also called one-over-f noise and why it matters at audio and direct-coupled frequencies rather than at radio frequencies. Thermal noise really is flat to well beyond any frequency an analogue radio uses. The contrast is what decides where each mechanism must be designed against, and it explains why chopper and modulation techniques move a low-frequency measurement up in frequency to escape flicker noise entirely.
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