 Welcome. This unit is an introduction to the central properties of sound waves and introduces such fundamental aspects as frequency and resonance. In the virtual session with its question sheet as default guidance, we will look at the acoustic properties of sound waves and the phenomenon of resonance. The mastery worksheet is a simple multiple choice test which wants to check whether you remember the central properties of sound waves. And the practical is simple too. It relates sound waves and resonances to the anatomy of the vocal tract. Well, and that's it. Overall, a fairly basic unit.