This is the last video of the module Origins of the Sine Wave, where we keep the math aside break 3 questions holistically. Why did we talk about periodic functions in the context of audio? What physical attribute does a sine wave represent in the real world? And why does a sine wave produce a pure tone? 

Contents:

0:00 Questions to address
0:42 Why talk about periodic functions
2:11 Sinusoidal motion of bodies
2:50 What does a sine wave represent
5:08 Why is sine wave a pure tone

Follow the series to derive the sinusoidal equation and fundamentally understand what it represents. 

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