Propagation of Sound : Sound - Science, Class 9 Video Lecture

welcome to learn next here's a sample
from our lesson production and
propagation of sound
some waves in air are longitudinal waves
to understand what that implies we need
to first understand the two categories
of waves
in transverse waves the particles of the
medium vibrate up and down about the
mean position which is in the direction
perpendicular to the direction of wave
propagation
when we fix one end of a string and
vibrate the other end in a direction
perpendicular to the length of the
string the wave pattern that is seen is
that of a transverse wave
when a pebble is thrown onto the surface
of still water it creates small ripples
these ripples propagate through the
expanse of the water as transverse waves
in fact try and observe closely tiny
particles and dried leaves on the
surface when ripples are formed
these particles do not go with the wave
but just move up and down and their
positions about a mean position
this figure depicts the propagation of a
transverse wave
you learn more about transverse waves in
higher classes in longitudinal waves the
direction of vibration of the particles
in the medium is parallel to the
direction of propagation of the wave
the wave pattern set in the slinky is an
example of the longitudinal wave
you