Discussion
At \( 290 \ \mathrm{K} \) the thermal noise floor per hertz is about
Answer: C
The standard figure is -174 dBm per hertz, and adding ten times the logarithm of the bandwidth gives the power in any band: -114 dBm in a megahertz, -144 dBm in a kilohertz. -204 dBm would correspond to a much lower temperature. Carrying the -174 figure and the decibel bandwidth correction together is the quickest way to estimate any receiver's noise floor, and it is worth committing to memory.
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