thecrazyone asked in Science & MathematicsPhysics · 1 decade ago

# Can someone explain Quantum Physics? Or the Quantum theory?

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• 1 decade ago

that's a very broad question. because all the branches of physics are intertwined with each other.

Umm.. a basic principle of quantum theory is the observation that the smallest pieces of matter, electrons, exhibit properties of both particles and waves. What an electron is doing at any given moment is a mystery to all of us. We can't just "look" at what the electron is doing to find out, though. The problem is that when we look at something, we're bombarding the electron with photons (light particles that have no mass, but carry momentum & energy). Hitting the electron with a photon changes the path, speed, etc of the electron and defeats the whole purpose of looking at it.

Instead we have to look at the end results of what electrons do - so there is an experiment called the double slit experiment which shows us where electrons hit a detector after passing through two small slits.

You might imagine that throwing electrons that passed through two holes would create two big blotches on the detector.

But the results of this experiment showed that the electrons hit the detector in a particular way - one that demonstrated that the path the electrons took was determined by wave-like motion, not like particle motion (diffraction).

Wierd - so actually, what we conclude is that the electrons took EVERY possible path from the source to the detector, and then upon observation, the resulting pattern arranged itself according to a probability distribution. Strange, yes.

Anyway, exploiting the fact that electrons' actions are governed by probability, we are able to conclude a lot of rules about electrons. Where they are, what their energy is, what their momentum is, .. all related to probability. And also all related to "standing waves." (very very complicated mathematics go here)

The thing about standing waves (imagine a violin string) is that they can vibrate at certain harmonics - either one half wave across the whole string, or one, or one and a half, as long as both ends are clamped down. But they can never be in between those. (Try it by shaking a rope faster and faster)

ANYWAY so this tells us that the amount of energy that electrons can carry can only be in certain amounts and never in between. When an electron gains or loses energy, it can only be enough to send it to the next lowest/highest energy level. Never in between. This is known as quantization, and you may know this as the "energy states" of electrons.

• 1 decade ago

The branch of physics that uses quantum theory to describe and predict the properties of a physical system.

Quantum mechanics (or quantum theory) is a physical science dealing with the behaviour of matter and waves on the scale of atoms and subatomic particles.

• Anonymous
4 years ago

It sounds unusual however it's quite complicated to give an explanation for in laymans phrases what quantum physics is given that it's this sort of massive and tricky field subject. It offers with subjects which can be widely theoretical however can have a few software in detailed "new" applied sciences such because the disorders of abilities boundaries etc. These disorders don't exist in nature however will also be artificially created and are utilized in small places of the electronics enterprise. Quantum physics additionally involves relativity which, of path, is almost always theoretical as a result of its very nature. If your pal has out of the blue determined that she is familiar with quantum physics, and he or she's no longer a physics scholar, then she's both mendacity or is a genius. I'll depart it as much as you to select which one. :)

• 1 decade ago

Quantum physics was invented to try and understand what goes on at the subatomic level. there is no way to observe what goes on there, so we have to use probability theory and expect everything, no matter how farfetched, to happen in this "inner space" world. Subatomic particles don't obey the laws that bigger things do. They can go faster than light, be in two places at once, and travel back and forth through time.

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• 1 decade ago

People trimming their tree. Making things look pretty. Putting things in their neat little place.

Check out advaita vedanta. It is basically saying the same thing in a different way. Except it actually helps you find the root to pull up so you can stop trimming the darn tree.

Then you become quantum physics, and you need not know what it is. Because ultimately there is no way of "knowing" only being.

Source(s): nisargadatta, ramana maharshi
• Anonymous

Quantum mechanics is a fundamental branch of theoretical 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, 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.

• Anonymous

there´s a really good book called "The Quantum Zoo" it explains very well the theory and its good reading material too, you should try finding it.

• Anonymous

The bodies which obey newton's laws do not have the velocity of light.These particles have dual particle, wave nature .for example electrons , protons, meusons etc. h/p=lambda

where lambda is the wavelength of the particle and p is momentum and h is planck's constant.

• 1 decade ago

if you want to read the postulates then go for some engg physics books or consult a physics teacher.

you can try:

www.quantum-physics.polytechnique.fr/en/

or wikipedia