Types of Waves
The material through which a disturbance travels. Medium The material through which a disturbance travels.
A single non-periodic disturbance. Pulse A single non-periodic disturbance.
A wave whose source is some form of periodic motion. Periodic wave A wave whose source is some form of periodic motion.
Electromagnetic waves A family of waves that do not require a medium for propagation.
A wave that requires a medium for propagation. Mechanical wave A wave that requires a medium for propagation.
Types of mechanical waves There are two main types of mechanical waves: Longitudinal Transverse
Longitudinal Longitudinal waves displace the medium parallel to the direction of wave motion.
Longitudinal animation Copyright (c) 1998-2005 "Siltec ltd" Wlo-avi
Transverse Transverse waves displace the medium perpendicular to the direction of wave motion.
Transverse animation Copyright (c) 1998-2005 "Siltec ltd" Wtr-avi
Water Waves Animation Copyright (c) 1998-2005 "Siltec ltd" Wwa-avi
Motion of the medium Note that mechanical waves displace the medium but do not carry the medium along with the wave.
Waves transport energy This means mechanical waves transport energy from place to place, not the medium.
Speed of Mechanical Waves
String T = tension in string µ = mass per unit length
µ vs. ρ
General Format for Mechanical Waves
Sound B = Bulk modulus ρ = density of medium
Speed of Sound in Air