1.+Introduction

=1. Introduction=

What are waves?

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> **sound waves** media type="youtube" key="L0b3_15DIos" height="275" width="448"
 * Waves are disturbances (energy) that propogates in a medium.
 * For tidal waves, energy travels through the medium of water.
 * there are many other waves in nature, like

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 * Electromagnetic waves ( example: visible light waves,microwaves, radio waves etc)**

**Stadium wave (aka Kallang wave)** media type="youtube" key="-SNCE_3QVxc" height="345" width="420"