Discussion
Which quantity is measured in kelvin?
Answer: B
Equivalent noise temperature is in kelvin, and it is the preferred measure in satellite and radio astronomy work because it discriminates better among very low noise figures. Noise figure is in decibels, noise factor is the same quantity as a plain ratio, and signal-to-noise ratio is a ratio or its decibel form. Four ways of expressing closely related ideas, and knowing which units each takes prevents them being mixed in one calculation. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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