Discussion
The main difference between the thermal noise and shot noise is that :
Answer: C
The keyed difference is that shot noise has a non-uniform spectrum in the high microwave frequency range.
Both thermal noise and shot noise are white over ordinary frequencies: their mean values are zero and their mean-square values are proportional to the noise bandwidth (\(4kTRB\) and \(2qIB\)). Those are similarities, not differences. Shot noise, however, arises from the discrete arrival of charge carriers, and at microwave frequencies, where the period approaches the carriers' transit time, its spectrum is no longer flat; transit-time effects make it rise with frequency.
The last option is false because shot noise depends on the current, not on temperature; only thermal noise is proportional to temperature.
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