Discussion
Indicate the false statement.
Answer: B
The false statement is that impulse noise voltage is independent of bandwidth. Impulse noise consists of short, strong pulses, and its voltage is directly proportional to the bandwidth of the receiver, so that a wider bandwidth passes more of it, which is why option B is false. The other statements are true: HF mixers are generally noisier than HF amplifiers, thermal noise power is independent of the frequency at which it is measured over the ordinary range, and industrial noise is typically impulsive.
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