Sound is vibration.

1
Sound is vibration.

• Can you see sound?
• How do we know its there?
• Lets feel it!
• Vocal chords
• Drum

We can hear and feel vibration.
2
What is vibration?

• Vibration is something that moves back and forth
  very fast.
• Lets Look!
• Ruler
• Rubber band
• String on a guitar

3
Tuning Fork In Water

• How do we know the tuning fork is vibrating?
• Can we see it?
• Can we hear it?
• What will happen when we put it in water?
• Can we see it?
• Can we hear it?
• What happened?

4
Sound Moves in Waves.

• What does a wave look like on the ocean?
• Sound waves are similar.
• Side View http//members.aol.com/nicholashl/waves
  /movingwaves.html
• Top View http//members.aol.com/nicholashl/waves/
  circularwaves.html

5
Sound can be loud and soft.Whats the difference?

• Loud sound wave
• Soft sound wave

They are taller.
They are shorter.
6
The loudness of sound is measured by decibels.
7
Sound can move fast and slow.

• Fast sound wave

• Slow sound wave

Sound is measured by vibrations per second. This
is called frequency. Its measurement tool is
called Hertz. (HZ) Tuning Fork A 440
HZ Middle C on the Keyboard 261 HZ
8
So, fast and slow vibrations make different high
and low sounds. We call that pitch.

• High pitch has fast vibration or high frequency.
• Low pitch has slow vibration or lower frequency.

9
Here is part of a keyboard showing the pitch and
matching frequencies.
http//vibrationdata.com/piano.htm
10
Lets check what you know!
Waves
Sound is ________________. Sound moves in
____________. Sound can be ___________. Sound
can be ____________. We measure loudness by
________. Highness and lowness of sound is
______________. The speed of the vibrations is
called _______________.
Vibration
Fast and slow
Loud and soft
Frequency
Decibels
Pitch
11
Wave Check!
Get out your pipe cleaners!
Loud wave
Soft wave
High wave
Low wave
12
Wave CHALLENGE

• High and soft
• Low and loud
• Soft and low
• Loud and high

13
Sound can move through objects.

• Sound can move through air, water, metal, wood.
• Tuning fork
• demonstration
• String telephone

• Sound can move through ________.
• Sound cannot move through ___________.

14
Vibration Experiment

• What will happen to the rice?
• How do we know?
• Lets find out.
• Are we correct?
• What happened?

15
String Telephone

• Speak into the phone.
• Can you hear each other?
• How does it work?
• What stops the sound?
• Who invented the telephone?
• What was his company called?

16
Sound can reflect.

Hard surface
http//members.aol.com/nicholashl/waves/reflection
1.html
17
Sound can be absorbed.
Soft surface
18
Imagine a square room with hard walls and a hard
floor.What would happen to the sound?
How could we fix it?
19
How do instruments make sound?
20
String Instruments

• Tighter the string higher the sound.
• Looser the string lower the sound.
• Shorter the string higher the sound.
• Longer the string lower the sound.

21
String instruments need a sound box or amplifier.

• These are usually made of wood.
• The amplifier needs a sound hole for the sound
  waves to escape.

22
Wind Instruments

• Shorter the pipe higher the sound.
• Longer the pipe lower the sound.
• Example recorder, slide whistle, bottles
• Faster the air speed higher the sound.
• Slower the air speed lower the sound.

Boomwhackers
23
Horn is Born.

• Ancient horns were made from large shells.
• Then horns were made from metal and were long and
  straight.
• Man learned how to bend metal and curve the tubes
• He later put valves and keys on them to make more
  sound changes.

24
Wind instruments need a mouthpiece or reed.
25
Percussion Instruments

• Bigger the instrument lower the sound.
• Smaller the instrument higher the sound.
• Tighter the membrane higher the sound.
• Looser the membrane lower the sound.