PSYCH 3A03 Lecture Notes - Musical Tone, Resonance, Tilting Train
6 Sep 2013
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Document Summary
This outline summarizes major points covered in lecture. It is not intended to replace your own lecture notes. Any object that can vibrate can transmit or receive sound. Any object with mass and elasticity can vibrate, and any object with mass has elasticity. Sound can travel through anything that vibrates, not just air. Air pressure is the weight of air surrounding an object. Air pressure provides a force on the eardrum. Ear is very sensitive, can detect pressure changes much smaller than the static air pressure. Due to gravity, air particles are more compressed and have a higher density closer to earth"s surface. Amplitude of vibratory displacement input force (hooke"s law) Systematic vibrations of an object are transmitted to the surrounding air molecules (mass of air) Systematic vibrations of an object will cause local changes in air pressure and thus the density of air. Input force is required to set an object into vibration molecules.
