Practise identifying longitudinal waves from parallel vibrations and compressions and rarefactions, especially for sound, ultrasound and seismic P-waves.
Describe how a longitudinal wave differs from a transverse wave.
any two from:
- (longitudinal) vibration / oscillation in wave parallel to propagation direction / direction of travel
- transverse wave vibrates / oscillates perpendicular to propagation direction / direction of travel
- (longitudinal) consists of compressions and rarefactions
- transverse wave consists of crests / peaks and troughs
- (longitudinal) needs a medium (to travel)