Introduction To Physics: At the current time, there are three main frontiers of fundamental science. First, the world of the extremely large, the universe itself, Radio telescopes now gather information from the far side of the universe plus have recently detected, as radio waves, the “firelight” of the big bang which probably started of the expanding universe nearly 20 billion years ago. Second, the world of the extremely little, that of the particles such as , electrons, protons, neutrons, mesons with others. The third border is the world of complex matter. It is too the world of “middle-sized” things, from molecules at one extreme to the earth at the other. This is every fundamental physics, which is the heart of science.
But what is physics? According to one definition, physics deals with the study of matter and energy and the relationship between them. The study of physics involves investigating such things as the laws of motion, the structure of space and time, the nature and type of forces that hold different materials together, the interaction between different particles, the interaction of electromagnetic radiation with matter and so on.
By the end of 19th century many physicists started believing that every thing about physics has been discovered. However, about the beginning of the twentieth century many new experimental facts revealed that the laws formulated by the previous investigators need modifications. Further researches gave birth to many new disciplines in physics such as nuclear physics which deals with atomic nuclei, Particle physics which is concerned with the ultimate particles of which the matter is composed, relativistic mechanics which deals with velocities approaching that of light and solid state physics which is concerned with the structure and properties of solids, but this list is by no means exhaustive.
Physics is most fundamental of all sciences and provides other branches of science, basic principles and fundamental laws. This overlapping of physics and other fields gave birth to new branches such as physical chemistry, biophysics, astrophysics, health physics etc. physics also plays an important role in the development of technology and engineering.
Science and technology are a potent force for change in the outlook of mankind. The information media and fast means of communications have brought all parts of the world in close contact with one another. Events in one part of the world immediately reverberate round the globe.
We are living in the age of information technology. The computer networks are products of chips developed from the basic ideas of physics. The chips are made of silicon. Silicon can be obtained from sand. It is up to us whether we make a sandcastle or a computer out of it.
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