History of Science

Science (from the Latin scienta meaning "knowledge") is, in its broadest sense, any systematic knowledge that is capable of resulting in a correct prediction or reliable outcome. In this sense, science may refer to a highly skilled technique, technology, or practice. In its more restricted modern sense, science is a system of acquiring knowledge based on scientific research, and to the organized body of knowledge gained through such research.

Science in this modern sense is a systematic enterprise of gathering knowledge about the world and organizing and condensing that knowledge into testable laws and theories This article focuses on science in this more restricted sense, sometimes called experimental science.

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A BRIEF HISTORY OF TIME

A BRIEF HISTORY OF TIME Stephen W. Hawking Our Picture of the Universe Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory... Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory. Today scientists describe the universe in terms of two basic partial theories - the general theory of relativity and quantum mechanics... The general theory of relativity describes the force of gravity and the large-scale structure of the universe, that is, the structure on scales fro...

What is the Photoelectric Effect?

The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light. Energy contained within the incident light is absorbed by electrons within the metal, giving the electrons sufficient energy to be 'knocked' out of, that is, emitted from, the surface of the metal. Using the classical Maxwell wave theory of light, the more intense the incident light the greater the energy with which the electrons should be ejected from the metal. That is, the average energy carried by an ejected (photoelectric) electron should increase with the intensity of the incident light. In fact, Lénard found that this was not so. Rather, he found the energies of the emitted electrons to be independent of the intensity of the incident radiation. Einstein (1905) successfully resolved this paradox by proposing that the incident light consisted of individual quanta, called photons, that interacted with the electr...

The Way Universe Is!!!

Date : 1 Bhadra 2067, (2011) Place: In my Room Yesterday when I was Working on my project" Effect on Inflation on the Creation of the universe". I was really surprised when I read the thought of Stephen Hawking (My ideal Person). I really liked the universe the way it is. We are known that the universe is going expanding day by day. this was first purposed by Edwin Hubble after a long study of the stars. He makes such a conclusion that the light coming from the stars is moving towards the red spectrum. this thought makes the revolution at that time. I really appreciate that thought that he put forward at that time because he shows his courage as many physicists as well as other scientists were against him as they have to search for the new scientists to explain this truth. So they simply put forward the thought of "Stationary Orbit Theory". this theory deals that the stars and other heavenly bodies originated from the stationary thing that the universe has. But th...

Space Science and Exploration

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