Discussion
Which unit is dimensionless?
Answer: C
The decibel expresses a ratio, so it carries no dimensions; the volt, watt and hertz are all dimensional units. That is why an absolute level must be written with a reference attached, as dBm or dBW or dBV, and why adding two plain decibel figures is meaningful while adding two dBm figures is not. Keeping ratio units and absolute units distinct removes most of the confusion beginners have with link budgets.
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