Fundamentals of sound

779 views

Published on

Published in: Business, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
779
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
15
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Fundamentals of sound

  1. 1. Fundamentals of Sound From musical boxes to iPods
  2. 2. 2 Sound travels to your ear The air vibrates but does not travel from the alarm to the ear. Sound
  3. 3. 3 Whales sing to each other. Sound travels through water.
  4. 4. 4 Telephones --  Are like a sound system The electrical signal is amplified A microphone changes sound to an electrical signal. A loudspeaker changes the electrical signal to sound.
  5. 5. 5 Telephones --  The message travels through miles of wires as an electrical signal. microphone loudspeaker electrical signal
  6. 6. 6 Radio signal 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. Sound - electrical signal - radio signal - electrical signal - sound In the second phone the radio signal is changed into an electrical signal then into sound.Mobile phone beacons
  7. 7. 7 What is this? What sound does she make?
  8. 8. 8 What are these?  What sound do they make?
  9. 9. 9 What sound does this make?  How does it make the sound?
  10. 10. 10 Bells  What sounds will they make?
  11. 11. 11 Size matters! Large things make ___________ sounds Small things make ___________ sounds
  12. 12. 12 New words:  High pitch = high frequency  Low pitch = low frequency
  13. 13. 13 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.
  14. 14. 14 Can you spot the baby? Sound has lots of uses
  15. 15. 15 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

×