Un libro è un insieme di fogli, stampati oppure manoscritti, delle stesse dimensioni, rilegati insieme in un certo ordine e racchiusi da una copertina.. Il libro è il veicolo più diffuso del sapere. When an object vibrates, it causes the surrounding air molecules to vibrate, initiating a chain reaction of sound wave vibrations throughout the medium. In physiology, sound is produced when an object’s vibrations move through a medium until they enter the human eardrum. Each Concept Builder focuses the learner's attention upon a discrete learning outcome. This website is an ongoing project to create a comprehensive library of physics demonstrations, simulations, videos, and other useful resources available at the Harvard Science Center. Two common categories of waves are transverse waves and longitudinal waves. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. The categories distinguish between waves in terms of a comparison of the direction of the particle motion relative to the direction of the energy transport. Waves involve a transport of energy from one location to another location while the particles of the medium vibrate about a fixed position. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.. Waves and Sound A Concept-Builder is an interactive questioning module that presents learners with carefully crafted questions that target various aspects of a concept. In physics, sound is produced in the form of a pressure wave.
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