# Shared Flashcard Set

## Details

Chapter 02
Sound
19
Physics
08/20/2018

Term
 Acoustic Propagation Properties
Definition
 The effects of the medium upon the sound wave
Term
 Biological Effects
Definition
 The effects of the sound wave upon the biologic tissue through which it passes
Term
 Waves...
Definition
 ...carry energy from one location to another
Term
 Sound Waves...
Definition
 ...are mechanical ...move through a medium as a result of physical vibration (compression and rarefaction, like a Slinky) ...cannot travel in a vacuum ..travel in a straight line ...are longitudinal
Term
 Compression
Definition
 Low dispersion of molecules
Term
 Rarefaction
Definition
 High dispersion of molecules
Term
 Cycle
Definition
 One compression and one rarefaction One peak and one trough
Term
 Acoustic Variables
Definition
 Properties of sound waves that may chance as they travel through a medium; used to distinguish sound waves from other waves due to rhythmic oscillation Pressure Density Distance
Term
 Pressure
Definition
 The concentration of force in an area Units: pascals (Pa)
Term
 Density
Definition
 The concentration of mass in a volume Units: kg/cm^3
Term
 Distance
Definition
 A measure of particle motion Units: cm, mm, nm
Term
 Acoustic Parameters
Definition
 Features and characteristics used to describe a sound wave Period Frequency Amplitude Power Intensity Wavelength Propagation speed
Term
 Transverse Wave
Definition
 Particles move perpendicular to the direction of wave propagation
Term
 Longitudinal Waves
Definition
 Particles move in the same direction of wave propagation
Term
 In Phase Waves
Definition
 When the peaks and troughs of 2+ waves match perfectly to enhance the effect of each other
Term
 Out of Phase Waves
Definition
 When the peaks and troughs of 2+ waves occur at different types to mitigate the effects of each other
Term
 Interference
Definition
 When more than one sound beam travels through a medium, multiple beams may arrive at a give point simultaneously, lose their individual characteristics, and combine to form one wave   Constructive vs Destructive   When waves of different frequencies interfere with each other, constructive and destructive interference can result
Term
 Constructive Interference
Definition
 In-phase waves combine to form one wave with a resulting increase in amplitude
Term
 Destructive Interference
Definition
 Out-of-phase waves unite and form a single wave with a smaller amplitude
Supporting users have an ad free experience!