The table below summarizes the different properties of waves.
Type of Wave 
Term 
Definition 
Transverse 
Crest 
The highest point of the wave. 

Trough 
The lowest point of the wave. 
Longitudinal 
Compression 
An area where the material or medium is condensed and at higher pressure. 

Rarefaction 
An area that follows a compression where the material or medium is spread out and at lower pressure. 
Transverse & Longitudinal 
Amplitude 
The distance from the midpoint to the point of 


maximum displacement (crest or compression). 

Frequency 
The number of vibrations that occur in one second; the inverse of the period. 

Period 
The time it takes for a wave to complete one full vibration; the inverse of the frequency. 

Wavelength 
The distance from one point on the wave to the next identical point; the length of the wave. 