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What is the level of the noise floor?

The thermal noise is at 174 dBm/Hz. A spectrum analyzer has a resolution bandwidth of 1 kHz and a 5 dB noise figure.

What is the level of the noise floor?
A . 174 dBm
B . 139 dBm
C . 144 dBm
D . 204 dBm

Answer: B

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