Un microfono on-line per “vedere” la riflessione del suono in un tubo per “sentire” l’accelerazione di gravità

On-line data acquisition systems have disclosed new possibilities for teaching physics laboratory. A cheap and easy apparatus, as the one here described, allows to easily perform interesting experiments or to re-design old experiments making them suitable for schools that have no laboratory, and even for outdoor use. A microphone, for example, may be used to investigate the sound velocity and to measure the gravity acceleration.