With the help of Geiger he found the number of alpha particles emitted per second by a gram of radium. He was also able to confirm that alpha particles cause a faint but discrete flash when striking luminescent zinc sulfide screen. These great accomplishments are all overshadowed by Rutherford's famous Gold Foil experiment which revolutionized the atomic model. This experiment was Rutherford's most notable achievement. It not only disproved Thomson's atomic model but also paved the way for such discoveries as the atomic bomb and nuclear power.
Bohr’s model of the hydrogen atom explained /observed spectral lines so well that many scientists concluded that the model could be applied to all atoms (pg.103, line 8). It was soon recognized, however, that Bohr’s approach didn’t explain the spectrum of atoms with more than one electron, nor did his theory explain the chemical behavior of atoms (pg.103, line 10). Most significantly, Bohr’s model violates the uncertainty principle because it features electrons with known orbital periods and a definite radius-two attributes which cannot be directly determined simultaneously (aps.org/physics). So basically, Bohr’s model was proved not true, because you cannot know exactly where an electron is at any given moment. Bohr’s model caused scientists to start asking questions.
Epicurus' theory is not necessarily superior, but certainly progressive. There is room for discourse on a variety of the Atomists' theories. Since they are the first school of thought from which we have so much written record, there is bound to be divergence of opinion. The areas I have discussed relate only the area of physics. Epicurus attempts to resolve some of the dilemmas Democritus leaves unresolved in ethical and psychological dilemmas as well.
Reactor breeders show great promise in nuclear waste, but are it enough to convince the nation? Introduction Nuclear knowledge has existed for a long time. Nuclear Engineering U.S. Department of Energy relates, ―By 1900, the physicists knew the atom contains large quantities of energy‖ (par 11). Many others formed good theories, such as Ernest Rutherford and Einstein’s contribution with his equation E=mc^2. In 1934 a physicist known as Enrico Fermi conducted an experiment that resulted in the splitting of atoms.
Although there was excitement for the U.S. being the first with the bomb some scientists did not share that excitement. Not all people agreed with the idea to build this bomb, some people had their doubts. For example, Julius Robert Oppenheimer was a highly known theoretical physicist and Director of the Los Alamos Laboratories. With his experience he had many doubts about the Hydrogen Bomb, wither it would work. “Oppenheimer and others on technical and moral grounds had initially opposed building the H-bomb, seeking instead an international moratorium on its development” (Teller and Ulam).
With the gold foil experiment, tested by Ernest Rutherford, he discovered the existence of the positively charged nucleus. He proved this when the experiment was happening, a small fraction of the photons th... ... middle of paper ... ...lieve that there really is a Higgs Boson particle. I know they have not found it yet but there is lots of evidence to prove that there is a Higgs Boson particle. We as a science community have not been using the right experiments to find the particle. There are lots of things that when put together makes proof of the missing Higgs Boson particle.
The process of fission is the simply put, the breaking apart of heavy atoms to create lighter more stable atoms. Most elements try to become more stable through the processes of fusion or fission. These elements will generally form into a noble gas, those elements in ... ... middle of paper ... ...m is that nobody has been able to disprove this theory. The founder of the theory, J. M. Herndon says, “I wish someone would respond, tell me that the science is wrong, but I just get nothing.” This says a great deal about the validity of these arguments. Anyone who would disagree would simply be ignoring the plethora of evidence stacked against other arguments.
The theory was proved incorrect after experiments showed that light under certain frequencies did not produce the photoelectric effect on the metal, which meant that the emitting of electrons is related not to intensity but the waves frequency. A new string of mechanics, Quantum mechanics, was created in order to resolve the incompatibilities of Classical Mechanics. A main difference between the two fields of mechanics is the make up of the atom. In Quantum mechanics electrons in an atom are outside of the nucleus in specific orbitals around the nucleus that they can jump from one to another only when a specific energy level is reached, and can never be in-between the specific orbitals. Also Quantum mechanics says that a photon is released only when an electron jumps from a higher energy level to a lower energy level, or a higher energy orbital to a lower energy orbital.
Little effort was made to make atomic theory quantitative--that is, to develop it as a scientific hypothesis for the study of matter. Greek atomism, however, did introduce the valuable concept that the nature of everyday things was to be understood in terms of an invisible substructure of objects with unfamiliar properties. Democritus stated this especially clearly in one of the few sayings of his that has been preserved: "Color exists by convention, sweet by convention, bitter by convention, in reality nothing exists but atoms and the void." Although adopted and extended by such later ancient thinkers as EPICURUS and LUCRETIUS, Greek atomic theory had strong competition from other views of the nature of matter. One such view was the four-element theory of EMPEDOCLES.
2000-Present- Andrea Rossi- (Not really cold fusion) but he has developed a device called an E-Cat that involves Nickel and Hydrogen reactions. These small nuclear reactions emit rather significant amounts of energy. Rossi himself doesn’t want to associate his device with “Cold Fusion’ due to the fact that the field itself has such negativity involved. (Thanks Nuclear Physicists) Another important thing to mention is that no radioactive materials are used and or produced, only metals like Nickel and some Copper are produced. Any radiation that is produced in the nuclear reaction will only last for a maximum lifetime of 20 minutes, this is due to the fact that the radiation itself is thermalized.