







wave  v_{w} = ¦ l 
mechanical  speed of waves in strings/ropes 
wavelength  longitudinal 
compression  rarefaction 
point source  amplitude 
period (T)  hertz 
frequency (f)  vibration 
equilibrium position  wavelength (l) 
atmospheric pressure  period (T) 
vibration  frequency (¦) 
relationship between frequency and wavelength (¦,l)  relationship between frequency and period (¦,T) 
wave velocity (v_{w})  standing waveform for an open water column 
infrasonic  human range of frequencies 
radio waves vs sound waves  ultrasonic 
damped  heat 
interference  constructive 
destructive  antinodes 
reflection  nodes 
speed of sound (dry air)  speed of sound increases with the medium's rigidity, temperature and humidity 
forced vibration  natural frequency 
resonance  fixedend reflector 
loops  freeend reflector 
echo  reverberation 
Formulas 
v_{w} = f l  T = 1 / f  d = r t  
speed of sound in dry air  v_{w} = 331 + 0.6 T  
openopen pipe rods only clamped at their centers 
f_{n} = ( n + 1 ) f_{o}  for the fundamental ANA L = 1 loop = ½ l 

openclosed pipe  f_{n} = ( 2n + 1 ) f_{o}  for the fundamental AN L = ½ loop = ¼ l 

clampedclamped wire  f_{n} = ( n + 1 ) f_{o}  for the fundamental NAN L = 1 loop = ½ l 