Concept Map

Concept Trailer

Key Terms

acoustic impedance

property of medium that makes the propagation of sound waves more difficult

antinode

point of maximum displacement

Doppler effect

an alteration in the observed frequency of a sound due to motion of either the source or the observer

fundamental

the lowest-frequency resonance

harmonics

the term used to refer collectively to the fundamental and its overtones

hearing

the perception of sound

infrasound

sounds below 20 Hz

intensity

the power per unit area carried by a wave

intensity reflection coefficient

a measure of the ratio of the intensity of the wave reflected off a boundary between two media relative to the intensity of the incident wave

loudness

the perception of sound intensity

node

point of zero displacement

note

basic unit of music with specific names, combined to generate tunes

overtones

all resonant frequencies higher than the fundamental

phon

the numerical unit of loudness

pitch

the perception of the frequency of a sound

sound

a disturbance of matter that is transmitted from its source outward

sound intensity level

a unitless quantity telling you the level of the sound relative to a fixed standard

sound pressure level

the ratio of the pressure amplitude to a reference pressure

tone

number and relative intensity of multiple sound frequencies

ultrasound

sounds above 20,000 Hz

More terms can be found in the textbook dictionary.