What is quantum theory ?(please answer as explaining to high school student)(no useless comment please )?

Answer 1

in the classical theory(newton's mechanics, maxwell's electromagnetic theory etc), the physical quantities like energy of a particle can have any valuewhich can vary continuously. in the quantum theory( for example,applied to a hydrogen or othe atoms), the energy of the orbiting electron can have certain discrete values.there are gaps between these values and the electron cannot have a value inthis gap.bohr's quantum theory or schrodinger's equation apply to these microscopic systems

Answer 2

Quantum Mechanics is a theory of matter in which all particle properties are derived from solutions to an equation with space and time as variables called a "wave equation". The solution is a continuous function of both space and time called a "wave function". To get a mental picture of its nature, a more familiar example of a wave function in classical mechanics is air pressure as a function of position and time for a sound wave. In QM, though, particle properties such as *its* position, momentum, and energy are derived from the wave function. In general one cannot determine precise values of these properties, per se, but only the probability of the value being within certain bounds. This makes QM, therefore, a probabilistic theory, where one cannot predict all properties with absolute precision. Presented as a fundamental theory of the way the universe really works, as opposed to a mere limitation of our humble knowledge of it, this feature has lead to much philosophizing, discomfort, objection, and consternation about the meaning of life, the universe, and everything.

Answer 3

Quantum theory is the physics of atomic and subatomic particles (including light photons). Basically, it provides accurate and precise descriptions for many phenomena that classical theories simply cannot explain on the atomic and subatomic level. Things this small behave in a probabilistic way -- sometimes they do one thing, sometimes another, and there is absolutely no way to tell in advance what any one particle is going to do.

Answer 4

put a little more simply, although not quite as accurate, things like electrons are set distances from the nucleas of an atom. they could be 1, 2, 3, 4, 5, ect units away, but not 1.3, 5.2, 6.45, ect units away. the distances are quantized, thus the name quantum theory

Answer 5

the quantum theory of light states that light is an eletromagnetic radiation and does not need a medium to propogate and travels in waves and has a visible frequency.

Answer 6

The theory that as well as explaining light as traveling in waves, it can be explained as traveling in packets, like photons. Really it has properties of both.
http://en.wikipedia.org/wiki/Max_Planck