Transcript Telecommunication. Sound Waves. • Sound energy travels in the form of waves. • Sound can travel through solids , liquids and gases by vibrating the.

Telecommunication.
Sound Waves.
• Sound energy travels in the form of
waves.
• Sound can travel through solids , liquids
and gases by vibrating the particles in
the three types of materials.
Telecommunication.
Sound Waves.
• The particles in the three materials
vibrate in the same direction as the
wave motion.
• This wave is called a Longitudinal Wave
Sound
waves
cannot
travel in a
vacuum.
Telecommunications.
Sound Waves.
• These waves then vibrate our ear drums
which then activate small bones in our
inner ear.
• A diagram of the ear is shown.
Telecommunication.
The Ear.
bones
Ear drum
Outer ear
Telecommunication.
The difference between sound and light waves.
• Sound waves travel very
much slower than light
waves.
• This can be seen by
observing a thunder and
lightning storm.
• The light reaches us
quickly but the sound
from the thunder comes
later.
Telecommunication The speed of sound.
• The speed of sound can be measured by by
using two microphones and an electronic
timer.
• When the sound reaches the first mic, the
timer starts.When the sound reaches the
second mic, the timer stops.
• If we know the distance between the two
mics (say one metre) and the time , we can
work out the speed.This is shown on the next
slide.
TELECOMMUNICATION. THE SPEED OF SOUND.
Time = 0.003s
Mic 2
Mic 1
Sound
here
Distance = 1 metre
Telecommunication.
Calculation of The Speed of Sound
• The Speed of Sound can be calculated
as shown below.
• Speed = distance
time
=
1/0.003
= 330 m / s
Telecommunication.
The difference between sound and
light waves.
• Light is a transverse wave.The particles
move at right angles to the wave as shown.