sound: pessure waves produced when an object vibratesat a frequency between 20 Hz and 20000 Hz and there is a material medium that sound can travel through.
loudness: how loud or soft a sound is; loudness is related to the amount of energy that reaches our ears per unit of time.
pitch: how high or low a sound is; pitch is related to the frequency of the vibration that produces the sound.
timbre: quiality of a sound that makes it different to other sounds of the same pitch and loudness; timbre is related to the shape of the sound wave.
echo: reflection of sound from a surface that is more than 17 m away from the emitter.
reverberation: reflection of sound on a surface that is less than 17 m away from the emitter.
vibration: mechanical oscillation; movement of an object around a central position of equilibrium.
oscillation: repeated variation around a central position of equilibrium, first in one direction and then in the other.
compression: increase in air pressure that forms part of a sound wave.
rarefaction: decrease in air pressure that forms part of a sound wave.
electrical impulse: signal carried by the nervous system
propagate: multiply or increase, spread to a larger area.
disturbance: change in normal coditions.
homogenous: uniform in composotion; all parts have the same properties
hearing threshlod: minimum loudness at which we can hear sounds.
pain threshold: loudness at which sound becomes intolerable for the listener.
attenuate: decrese the intensity of something
pollution: contamination of the enviroment, often caused by human activity.
silencer: part of a machine designed to muffle sound emissions.