Variations in air pressure against the eardrum. The subsequent physical and neurological processing and interpretation, give rise to the experience called sound. Most sound that people recognize as "musical" is dominated by periodic or regular vibrations rather than non-periodic ones (called a definite pitch and we refer to the transmission mechanism as a "sound wave". In a very simple case, the sound of a sine wave, which is considered the most basic model of a …showed first 75 words of 617 total…

…showed last 75 words of 617 total…that will vibrate naturally at the same frequency, the vibration of the body is called sympathetic vibration. A reinforcement of sound resulting from sympathetic vibration is called resonance. When the vibrations of a sound-producing body cause another body to vibrate in the same frequency, not normally its own, the vibration is known as forced vibration. Heat is commonly defined as the energy of molecules, part of which consists of the energy of their vibrational motion.