SOUNDS GOOD

1
SOUNDS GOOD!

• From musical boxes to iPods

2
Space Walk
Aug 2005 Stephen Robinson outside Discovery
NASA picture
3
Can he call to those inside the space ship as he
works?
NASA picture
4
Connected to the space ship by a line
Why?
NASA picture
5
Lets play some games !
6
Sound dance
Sound moves this way
steps

• The bunches move along the line.
• The children do not move along!

7
Sound travels to your ear
Sound

• The air vibrates
• but does not travel from
• the alarm to the ear.

8
Large ears to collect sound

• Our ears are on the side of our heads.
• We can play a game to find out why.

9
?

• Why does Mittens look unhappy?

10
Whales sing to each other.

• Sound travels through water.

11
(No Transcript)
12
Bush telephone game

• Sound travels through the string

13
Telephones --

• Are like a sound system

14
Telephones --

• The message travels through miles of wires as an
  electrical signal.

electrical signal
15
Mobile phones use radio Sound - electrical
signal - radio signal - electrical signal - sound

• In one phone the sound is changed into an
  electrical signal then into a radio signal.

In the second phone the radio signal is
changed into an electrical signal then into
sound.
Radio signal
Mobile phone beacons

• Sound - electrical signal - radio signal -
  electrical signal - sound

16
What is this?

• What sound does she make?

17
What are these?

• What sound do they make?

18
What sound does this make?

• How does it make the sound?

19
Bells

• What sounds will they make?

20
Straw oboes

• Listen as the straw is snipped.

21
Size matters!

• Large things make
• ___________ sounds
• Small things make
• ___________ sounds

22
New words

• High pitch
• high frequency
• Low pitch
• low frequency

23
Size matters!
24
What else changes sounds?

• How do you tune a violin?
• Let us try to make a string instrument.

25
What have we learned?

• Vibrating objects make sounds
• Sound needs a medium through which to travel
  air, water, string - - -
• The medium vibrates but does not travel with the
  sound
• Large vibrations make loud sounds
• - small vibrations make quiet sounds
• Large objects make low frequency sounds
• - small objects make high frequency sounds
• In strings the frequency of the sound depends
  on the length, thickness, and tension.

26
Can you spot the baby?

• Sound has lots of uses

27
Ultrasound is very, very high frequency sound.

• It is used to see inside people
• - to see
• babies before
• they are born
• if a heart is
• working well
• blood flow

28
Knowledge about sound helps -

• Musical instrument design
• and playing them
• Sailors find how deep the water is
• Building design
• so we hear sounds clearly in meetings
• so sound does not travel through walls
• Sound systems for everyone
• radio - CD players
• mobile phones - iPods

29
Physics is everywhere

• From kittens ears to mobile phones