Summary of today's lesson on SOUND

In today's lesson, you learnt about the following:
(a) Pitch = frequency
(b) Loudness = amplitude
(c) Quality or Timbre = related to the shape of the signal


Imagine that the sound wave is like a broom that sweeps particles away from it. 
The point where the broom is IS KNOWN AS the rarefraction
The point where all the particles is swept to is known as compression


There are many applications of sound or ultrasound as shown in these video clips: 


1. Ultrasound Non-Destructive Testing NDT of Composite Carbon Material
http://www.youtube.com/watch?v=TkH0LLpmx8c


2. Introduction to Ultrasonic Inspection - Animated "EZ to Learn"
http://www.youtube.com/watch?v=9-BHDoiii2Y 


3. 2009 Ultrasound at Medical Clinic
http://www.youtube.com/watch?v=8p7cnWzKPfs


4. Cymatic experiment
http://www.youtube.com/watch?v=GtiSCBXbHAg


5. Pipe inspection services for PCCP
http://www.youtube.com/watch?v=eCvylTAH1hM