In this guide, we provide you, presenting veils just below a small selection of notes of modern physics, which are useful for all students of physics concerned or for anyone who wants to know more about about an individual interest or its own special passion for this fascinating subject.

At the end of the nineteenth century, the discovery of electron, the detection of radioactive spectra, the new data provided by the development of techniques and equipment for measurement, caused a fundamental change in the formulation of laws designed their subsequent interpretation. Numerous experimental results, it led to the birth of new physics that modern physics.

The main issues that fueled the theoretical birth of modern physics can therefore attributable to the absence of the identification of ether, conductive medium of electromagnetic waves in the context of electromagnetism , all in the light of fundamental discovery, cited in the previous step, of electron and condition interpretative electromagnetic the radiation.


The concept of relativity starts from the principle of Galileo, whereby in the passage from a system of reference to another, the respective speeds are to accumulate to as carriers, for which the vector so-called speed, belonging to the light signal of a reference inertial, is going to be counted in order vector together with the speed of this, compared to another system inertial of a different type, providing the consequent indication of the speed of the light signal relative to the latter.

This paradox may be explicable by a reflection-type analog and comparative inherent in the study of elastic waves, accepting the existence of a means rarefied and extremely rigid, the deformations of which, would provide the positive response to the existence of electromagnetic fields. This medium is therefore the ether and its discovery brought to light the problem of identifying and defining a reference system fixed thereto. Furthermore, the detection of the motion of the Earth in comparison to ether, required the study of a more precise measure inherent in the speed of light, with respect to a part of ten thousand .