So far, all the topics we've studied are part of an area called Classical Physics. Although very useful, classical physics cannot correctly explain some important physical phenomena, such as the behavior of matter at atomic and subatomic scales.
In 1900, studies of the Quantum physics started, and took about 30 years to complete. In fact, we cannot yet claim that this theory is fully ready, since it is an area in which physicists are currently developing much scientific work.
Quantum physics can satisfactorily explain much of the unanswered problems until the early twentieth century. Moreover, this theory is also applicable to macroscopic systems, making its genius even more evident.
Our goal from now on is to explore some concepts of this new theory in order to introduce the basics of Quantum Physics and to understand why Classical Physics does not serve to explain phenomena on microscopic scales.