 Hi, I'm Aastha. I'm a physicist and currently doing my PhD in Solar Hydrogen Generation at the Research School of Electrical, Energy and Materials Engineering at the Australian National University. In this module, you'll be learning a lot about waves, different kinds of waves, mechanical waves, light waves, sound waves and how to use the properties of waves to make calculations and prediction as well as different applications of waves. A good understanding of waves and its concepts can enable a field of science such as optics, sound engineering which can lead you to entertainment industry or a lot of medical applications, civil engineering, mechanical engineering which will help you in building your bridges, buildings and all these kind of things. Knowledge of waves would really help you have an upper hand in any of these fields or a lot of others where you go. The goal of my research is to develop low cost solar hydrogen generation systems and I'm basically using solar energy to split water into producing hydrogen fuel and oxygen. Now the oxygen that you get as a by-product can again be used in a lot of industrial applications making it a total green and profitable system to produce hydrogen fuel. I'm specifically looking into silicon based systems owing to its popularity in solar photovoltaics. To create this, I combine my knowledge of semiconductor physics, electronics, quantum mechanics, a bit of chemistry and a lot of calculus. I mostly do a lot of experiments in the lab trying to develop these systems for low cost hydrogen generation and analyzing and collecting the data. I also do some theoretical models where I try to develop these models on my laptop and see how they want to behave in different kinds of conditions. This helps me understand the realistic behaviors of the system and try to design more appropriate and high efficiency systems. In this module, you will get a good understanding of basics of waves. It was first put together in 2016 by Joe Hope and Ed Sevik. Based on the feedbacks from students and teachers, I reviewed the module and made some modifications to make it better for you. I'll leave Joe and Ed to introduce themselves to you in the next video.