what is quantum phycis?

Answer 1

it is a branch of physics which started at the beginning of the 20th century

the word "quantum" derives from the fact that in some conditions, when you measure a physical observable (like the energy of an electron within an atom), there is only a discrete set of values that you can get

two of the most important concepts in quantum physics are the indetermination principle and the particle-wave duality

the indetermination principle states that there are couples of quantities that cannot be measured simultaneously with arbitrary precision: for example the position and velocity of an electron orbiting around a nucleus.

the particle-wave duality states that for every particle there is an associated wave, so two particles, like two waves, can extend over a finite space and interfere.

Answer 2

Everything in the world we can perceive on a "large scale" appears to be continuous. The Kinetic energy of a tennis ball can be any number between 0 and some high value with no values disallowed.
It was discovered that when we consider very small particles in the atomic realm that these principles no longer apply. An electron circling an atom is not like a tennis ball in that it cannot assume any value of kinetic energy but is limited to a few "quantum states". In fact no two electrons circling an atom can have (or "occupy") the same quantum state.
The term quantum (or packet) of energy is used to describe this phenomenon. In the realm of the very small, particles cease to behave like like "tennis balls" that obey laws of physics that can be described by continuous functions.
Strange phenomena become the rule. A particle can only exist with specific energies, and if you try to measure its energy you change it in the act of measuring it so you can never know to exact precision what its original energy was before you measured it (the uncertainty principle).
Therefore quantum physics is a description of how particles behave on the atomic scale which is totally counter to the way we perceive things in the macroscopic Universe

Answer 3

Quantum mechanics (QM -- also known as quantum physics, or quantum theory) is a branch of physics which deals with physical phenomena at nanoscopic scales where the action is on the order of the Planck constant. It departs from classical mechanics primarily at the quantum realm of atomic and subatomic length scales

Answer 4

Quantum Physics is the physics of the very small; on the atomic and subatomic level.

Newtonian Physics has not changed since Isaac Newton invented them. A more complicated form of Physics can only be understood through calculus, which Isaac Newton also invented. The physics that astrophysicist and rocket engineers use to program a space probe to pass by Venus, Jupiter, Saturn and beyond or to land a probe on Mars or Titan are all the same physics that Newton invented. These are the fundamental rules of our Universe and of science. To violate these rules is to bring down everything we understand.

Quantum Physics were first invented in the 20th century and lead to the Nuclear Bomb. These physics were poorly understood back then, but after WW2 our understanding of them grew to the point of the great paradox. Quantum Physics doesn’t work in the real world, but it does in the world of the atom and to make matters worse normal physics break down in the Quantum world.

One of Einstein’s unfinished goals was to break this paradox. He worked on his Unified Field Theory; what scientists now call the theory of everything.

According to Wikipedia: http://en.wikipedia.org/wiki/Quantum_mechanics
“Quantum mechanics is a fundamental branch of theoretical physics with wide applications in experimental physics that replaces classical mechanics and classical electromagnetism at the atomic and subatomic levels. It is the underlying mathematical framework of many fields of physics and chemistry, including condensed matter physics, solid-state physics, atomic physics, molecular physics, computational chemistry, quantum chemistry, particle physics, and nuclear physics. Along with general relativity, quantum mechanics is one of the pillars of modern physics.

Quantum (Latin, "1 one") refers to discrete units that the theory assigns to certain physical quantities, such as the energy of an atom at rest (see Figure 1, at right). The discovery that waves could be measured in particle-like small packets of energy called loko led to the branch of physics that deals with atomic and subatomic systems which we today call Quantum Mechanics. The foundations of quantum mechanics were established during the first half of the twentieth century by Werner Heisenberg, Max Planck, Louis de Broglie, Niels Bohr, Erwin Schrödinger, Max Born, John von Neumann, Paul Dirac, Albert Einstein, Wolfgang Pauli and others. Some fundamental aspects of the theory are still actively studied.”

For more information I suggest you read the article.

Simply put though Quantum Physics is based on the energy level or Quanta that atomic and subatomic particles have. These energy states determine how nuclear physics work and it describes the reaction of chemicals that form moluclears including such complex structures as DNA. Clearly DNA works so quantum physics is valid, but conventional physics still doesn’t work at the subatomic level. Atoms that should fly apart from their momuntum are kept in tight orbits around their nucleas. The constant vibrating states of these subatomic particles and atomic particles cannot be explained with conventional physics. However, the operation of a computer, a TV and any electronic device is prefectly described by conventional physics. The next greatest advance in the physical sciences will be finding the solution to this paradox.

An example of Quantum Physics: Quarks come in 6 flavors; right, left, up, down, charm, and strange. A combination of these particles form subatomic particles like leptons, meuons and others. In turn these subatomic particles are combined to form electrons, protons, and neutrons. They also form positrons and other subatomic components the are more popularly known as antimatter.

When Hydrogen and Oxygen form to create a moluclear of water the reason for this is because the Oxygen atom has 2 electrons in its inner shell (which fills it up) and 6 electrons in its outer shell. All atoms want to have 8 electrons in their outer shell, those that do form the noble gases; which are very stable elements that don’t form chemical bonds. For Oxygen to reach 8 electrons it grabs 2 hydrogen atoms and shares one of each hydrogen atoms electrons. Since this sharing of electrons gives hydrogen a chance to have 8 electrons in its outer shell (1 from each hydrogen atom and 6 from the oxygen atom) the chemical bond is a stable one. To break this stable relationship energy has to be added to the system that will force the electrons into a higher state of excitement so the bonds can be loosen; creating hydrogen and oxygen gas.

To make matters more interesting the electrons don’t revolve around the nucleas in a pattern like the planets revolve around the sun. Actually the Electrons orbit in wildly varing orbits ignoring the laws of physics that would put them into a regular orbit. The electrons revolve in a cloud of probablilty. It is very hard to predict exactly where an orbiting electron really is. If it is one that is involved in a chemical bond then it becomes more difficult since some of those electrons actually leave their mother atom and revolve around the other atoms in the bond. Now to make things really difficult it has been found that it is impossible to know where these electrons are, because according to the Hisenburg Uncertanity Principle if you try to measure an electrons speed, mass, or location then the fact that you are doing that enters additonal energy into the system making your readings invald.

Another strange thing from Quantum physics is that light is both a particle and a wave. Photons have a wave form, but they interfere with each other as particles do. This contradiction can be seen in the physics experiment where a light source is shown through a prism and then toward a long card with two holes in it. The photons hit the card forming waves as if you threw a marble into a lake, but they create lines of interferience on the other side just like throwing a marble into a cloud of marbles.

Is it any wonder that people have a hard time understanding Quantum Phyiscs. Logically the rules don’t of it don’t make sense, however water is stil formed of two hydrogen atoms and one oxygen atom.

Answer 5

physics by quantity

Answer 6

http://en.wikipedia.org/wiki/Quantum_Physics

Answer 7

the very subatomic level of everything!!! and its nature
wikipedia.com it!!!

Answer 8

when you and your partner get it on