Risultati della ricerca
Anno XXVI - n.4 - ottobre/dicembre 1993 Un’esperienza sul campionamento di un segnale.
Exploring signal sampling techniques through an optical experiment. The reconstruction of an optical image of a simple pattern matched to a diffraction grating is proposed as an example of data analysis by digital method. Correspondence between analysis of time dependent digital signals and of spatial digital functions is outlined. […]
Anno XXVI - n.4 - ottobre/dicembre 1993 Assorbimento di calore e aumento di temperatura sono sempre sinonimi?
There are many misconceptions about physics which cause learning problems. In this article – the first of a series devoted to dismantle these misconceptions – we’ll try to show how heat absorption and temperature rise are not always the same thing. […]
Anno XXVI - n.4 - ottobre/dicembre 1993 Trasformazioni dell’energia solare
Bonacini Prize entry, 1991-92. The article briefly describes the experiments on solar energy done by 12 year old students, and their subsequent classroom discussion. […]
Anno XXVI - n.4 - ottobre/dicembre 1993 Svuotamento di un serbatoio d’acqua attraverso un tubo capillare
The article describes a simple experiment to illustrate the exponential decay of a water column. The liquid flows through a capillary tube obtained by removing the wire from a thin electric cable. […]
Anno XXVI - n.4 - ottobre/dicembre 1993 Verifica di un modello della fotoconduzione nei semiconduttori, basato sull’analisi della risposta alla luce, in regime statico e dinamico, di una fotoresistenza al CdS
Photoconductive CdS cells are cheap solid state devices, suitable for a first understanding of the optical properties of semiconductors. This work presents two experiments, concerned with static and dynamic behaviours of a CdS cell, which allows us to verify simplified model explaining semiconductors’ […]
Anno XXVI - n.4 - ottobre/dicembre 1993 Dilatazione di solidi, liquidi e gas: realizzazioni di semplici esperimenti quantitativi. 1° Premio 1991: Scuola media statale “L. Ariosto” – Albinea (RE). Classe 2a B
Simple quantitative experiments on thermal expansion (solids, liquids and gases). Bonacini Prize, 1990/91. The article describes the apparatus which 12 year old students used to measure the expansion of metal rods and rubber bands and briefly discusses results. […]
Anno XXVI - n.3 - luglio/settembre 1993 Alcune proposte di utilizzo della telecamera e del videoregistratore nel laboratorio didattico di fisica
This article, after examining advantages and disadvantages of the traditional use of cameras in physics laboratories at school, deals with the main characteristics of modern videocameras and VCRs; it also suggests a few applications of the relevant techniques which can be useful for classroom activity. […]
Anno XXVI - n.3 - luglio/settembre 1993 Un itinerario didattico introduttivo all’insegnamento dell’ottica
We present a recently developed project for teaching optics to 14-15 year old students. Pointing out some shortcomings of the traditional approaches, we take into account the students’ common sense “preconceptions” investigated in various inquiries. The teaching pattern we propose is rooted in everyday experience and the aim is to answer immediately questions such as: “how can we see what we see?”. […]
Anno XXVI - n.3 - luglio/settembre 1993 Uno strumento di valutazione né aperto né chiuso.
After a brief review of the problems connected with the use of open and closed tests, we present an instrument we developed (using some ideas of the APU project) where an almost completely open response is translated into dichotomous keys, suitable for computer processing. […]
Anno XXVI - n.3 - luglio/settembre 1993 La sedia di Piekara, un modello meccanico dei livelli energetici degli atomi (Traduzione da The Physics Teacher, vol. 29, n. 4, Aprile 1991 a cura di Silvia Pugliese Jona)
Piekara’s Chair is a macroscopic, classical model useful for explaining several atomic physics concepts and phenomena such as energy levels, spontaneous and stimulated emission, absorption and Boltzmann statistics. In this article the Model is described and possible classroom uses are suggested. […]
Anno XXVI - n.3 - luglio/settembre 1993 Concetti, esperimenti e pregiudizi: la lunga via verso la legge di Ohm. (Traduzione da Naturwissenschaften im Unterricht PHYSIK/CHEMIE n. 50, dicembre 1989, a cura di A.M. Fichera)
From 1775 to 1826 Ohm’s Law was gradually approached through the investigations of many researchers, stating with Cavendish. This article discusses the main experiments and the evolution of the underlying ideas, among which the concept of internal resistance of electrical generators eventually proved itself essential to Ohm’s discovery. […]