Engineering Physics Notes for BTech CSE Semester 1 - PTU / IKGPTU Chapterwise Notes

The word science comes from the Latin word scientia, which means 'to know'. Science is the knowledge gained through systematic observations and experiments. Scientific methods include systematic observation, reasoning, modeling, and theoretical prediction. Science is broadly divided into natural science and philosophical science, and physics is one of the main disciplines of natural science.

The word physics has its origin in the Greek word physis, meaning 'nature'. Physics is the most basic science that deals with the study of nature and natural phenomena, especially the properties of matter, energy, and their interactions. Understanding science begins with understanding physics.

Physics is an empirical study. Everything we know about the physical world and the principles governing its behavior has been learned through observations of nature. The ultimate test of any physical theory is its agreement with observations and measurements of physical phenomena.

Technology is the practical application of the doctrines of physics. The invention of the steam engine greatly influenced human civilization. Although Rutherford did not believe in 1933 that energy could be tapped from atoms, Hahn and Meitner discovered neutron-induced fission of uranium in 1938, forming the basis of nuclear reactors and nuclear weapons.

Physics has also contributed significantly to the development of alternative energy resources. Because fossil fuels are being consumed rapidly, there is an urgent need to discover cheaper and sustainable sources of energy. Electricity generation from solar and geothermal energy is now a reality, though much further progress is still needed.

Another example of physics leading to technology is the integrated chip or IC. The development of newer ICs and faster processors helped the computer industry grow rapidly over the last few decades. Computers became affordable due to improved production techniques and reduced costs.

The legitimate purpose of technology is to serve people. As society becomes increasingly science-oriented, we can contribute more effectively to science and society by developing a deeper understanding of the fundamental laws of physics.