1. Hearing and Sound

2. Transverse Waves – light waves

3. Sound Energy is produced by the vibration of matter and travels by compressional waves.

4. Speed of sound varies with the temperature.

5. Speed of sound changes with the type of medium.
speed of sound calculator

6. PBS video on Sound

7. Sound intensity relates to loudness. Sound frequency relates to pitch.

8. Loudness is a measure of amplitude.
It is also called INTENSITY!
The decibel was named after Alexander Graham Bell, the inventor of the telephone.

9. Hearing
Human Hearing

10. Hearing Range
Hearing test

12. Sonar
Sonar
Sonar in ships

13. Ultrasounds (above human range of hearing)
Examples: Bats
Echolocation

14. Humans and Echolocation
Daniel Kish

15. Other Uses for Ultrasounds
Imaging:
Baby
Echocardiogram of the heart

16. Speaking
Vocal cords

17. Music
Harmony- when notes sound pleasing together. It is actually a function of mathematical proportions.
Middle C is 256 Hz
High C is at 512Hz
Notes in between need to be
evenly divisible to sound good

18. Doppler Effect
Really Cool Doppler Demo

19. Doppler Radar
Doppler Effect on the Big Bang Theory

20. Wave Interference
Noise Cancelling Headphones

21. Speech Recognition by computer