2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29621The Johnson-Nyquist noise in narrow semiconducting wires having a transverse size smaller than the screening length is shown to be white up to frequency $D/L^2$ and to decay at higher frequencies as $ω^{-{1/2}}$. This result is contrasted with the noise spectra in neutral and charged liquids.3 pages, no figuresMesoscale and Nanoscale Physicstext