Lesson 7 Summary
- Wave is a disturbance that propagates from source carrying energy.
Waves that requirematerial medium for their propagation are called
mechanical waves; and those which do not require mediumfor their
propagation are known as electromagnetic waves. - Transverse waves are waves in which their direction of propagation
is perpendicular to the direction of vibrations of the particles of the
medium. However, the direction of movement of some waves is
parallel to the direction of vibrations of particles of the medium.
Such waves are called longitudinal waves. - Sound waves are themost common example of longitudinal waves.
They travel through any materialmedium with a speed that depends
on the properties (density) of the medium.