Discussion
Why is the equivalent noise temperature preferred to noise figure for very quiet amplifiers?
Answer: D
Because noise figures of 0.3 and 0.5 dB look almost identical while the corresponding noise temperatures of 21 K and 35 K differ by nearly half, the temperature scale discriminates far better in the low-noise regime that satellite and radio astronomy work occupies. It is defined against the same 290 kelvin reference rather than being independent of it. Both measures apply to passive components. And both need a calibrated source to measure. Choosing the scale that spreads out the range of interest is a general principle of good specification, and this is a clean example of it.
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