Longitudinal, mechanical wave produced by the vibration of a material object
Range of human hearing
Sound waves that are between 20-20,000 Hz (audible)
Sound waves less than 20 Hz which is too low to be heard
Sound waves that are greater than 20,000 Hz which is too high to be heard
A change in frequency due to relative motion between the source of waves and an observer. If the source and the observer are getting closer, the observed frequency would be higher
V shaped, two dimentional, overlapping crests
Cone shaped, three dimentional. Object is moving faster than the waves it is creating
Loud sound heard when the conical shell of compressed air from a shock wave strikes your eardrum
Faster than the speed of sound
Slower than the speed of sound
Number of times the speed of sound
Percieved highness or lowness of a sound, depending on the frequency of the sound waves
A reflection of sound arriving at the listener some time after the direct sound
(Sound Navigation and Ranging) Generic name for the technology that is used to locate objects underwater on a basis of acoustic echo.
SONAR used by animals.
Sound waves intefering destructively which cause spots of low amplitude.
Loudness or volume
Percieved size of sound wave.
Rate at which sound energy is transfered through a unit area.
Scale for measuring relative intensity. Loudness is a factor of 2. Intensity is a factor of 10.
Threshold of hearing
The softest sound that can be heard by the average human ear. (0 db)
Threshold of pain
Level above which audible sounds are painful. (120 db)
The ability of a material to resume its initial shape, the more elastic the medium, the better sound travels through it.
Pleasant sound when 2 or more pitches in small whole number ratios are played at the same time. (chords)
Unpleasant sound when 2 or more pitches played at the same time are not in small whole number ratios.
2 notes with frequencies related by the ratio 1:2
The inteference of 2 slightly different frequencies of sound cousing a fluctuation in loudness
The number of beats per second. fb=If2-f1I
Special sound formed from an objects own unique set of frequencies
Sound produced when an object is forced to vibrate at a certain frequency by another object.
A dramatic increase in amplitude when forced vibration matches objects natural frequency
Timbre (pronounced tambray)
tone color/quality due to presence of harmonics.(distinguishing different instruments playing the same note)