TH 2020- Midterm Exam Guide - Comprehensive Notes for the exam ( 16 pages long!)
Document Summary
P a t c h e t t | 1. Inverse square law - as a sound wave propagates spherically, the sound energy is distributed over the ever-increasing surface diameter of the wave front surface. The inverse square law teaches us that for every doubling of the distance from the sound source in a free field situation, the sound intensity will diminish by 6 decibels. This is the basis of transmitting sound. How to turn electromagnetic energy to acoustic energy: free electrons, moves up or down in a magnetic field, apply an alternating current repelling the coiled copper, this moves the cone vibrates acoustic energy. Transducing from one form of energy to another. Ohm"s law - the current through a conductor between two points is directly proportional to the voltage across the two points. I = the current through the conductor in units of amperes. V = the voltage measured across the conductor in units of volts.
