1/f noise, that amplitude of the wave was in inverse proportion to frequency value of alternating current, might appear when an electric current flowed through the vacuum tube. The reason of the noise was the resonance which interacted between electrons. Electrons were at constant positions that opened an interval and had lined up. These electrons made Kronig Penny's potential barriers. And there were another electrons flowing to the anode at same time. I consider the 1/f noise rose up by tonnnel resonance because these two kinds of electrons gave influence mutually.
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