PROFESSOR WITH HELIUM IN HIS LUNGS

Description
The class begins with an explanation of equation of waves. It leads to a discussion of fundamental and harmonics produced in musical instruments. The last part of the lecture should not be missed where the harmonics produced by a large number of instruments are compared visually.The last but not the least is where the professor fills his lungs with helium and then speaks. Watch this video to see what happens to him. Video courtesy: Youtube.com.