Articoli rivista
Anno XXVIII - n.4 - ottobre/dicembre 1995 Un esperimento dimostrativo sul fenomeno della fotoconducibilità, cioè della diminuzione di resistenza elettrica di un semiconduttore indotta dalla luce
This experiment demonstrates the photoconductive effect for Si and Ge samples illuminated by quasi monochromatic light. The vanishing of the effect for longer wavelengths allows a qualitative estimation of the fotonductive threshold which is related to the energy gap of the material. […]
Anno XLII - n.3 - luglio/settembre 2009 Un esperimento meccanico ed uno elettrico sul caos deterministico
The inverted torsional pendulum (often used as a tool to study non-linear oscillations and the transition to deterministic chaos) is here compared to an electric non-linear oscillator which shows a quite similar dynamic behaviour: the motion equation of the second system is exactly described by the Duffing equation, […]
Anno XXVIII - n.2 - aprile/giugno 1995 Un esperimento per determinare l’andamento del rapporto Q/V per un conduttore qualsiasi
This article describes a simple method to experiment the relation Q/V=const, by means of the direct measurement of Q and V. The necessary equipment can be easily found in any physics laboratory, as it is basically made of a 0-600V dc generator, […]
Anno XLVI - n.3 - luglio/settembre 2013 Un esperimento per introdurre il caos deterministico nei licei
In this work it is shown how it is possible to build a simple device: the dripping faucet. This physical system exhibits an extremely interesting dynamic behaviour, useful to introduce the subject of deterministic chaos in high schools […]
Anno XLIII - n.3 - luglio/settembre 2010 Un esperimento per sfida: X Scotch
Triboluminescence was studied using a self-built 8-litre vacuum chamber operated at a pressure of about 1mtorr. Luminescence is observed in the chamber along the peeling line of an unrolled adhesive tape. The tribo-mechanism produced electrons and X-rays are revealed by the intense luminescence of a BGO crystal positioned close to the peeling line. […]
Anno XXIX - n.3 - luglio/settembre 1996 Un esperimento sulla dissipazione in un sistema meccanico
A simple dissipative mechanical system is discussed in order to introduce, at high school level, the basic ideas on which are founded some typical experimental techniques concerning condensed matter. Some reflections are made concerning the passage from a macroscopic description to a microscopic one. […]
Anno XXVII - n.2 - aprile/giugno 1994 Un esperimento sulla legge di Lenz. (Traduzione da The Physics Teacher, febbraio 1992, a cura di Giacomo Torzo)
The Lenz law is studied experimentally using a permanent magnet falling inside metal tube. A home made force sensor is used to measure the weight of the tube and steady magnet before the experiment, and then to weight the vertically suspended tube when the magnet is dropped. […]