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Results tagged with quantum-mechanics
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user 264639
Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.
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Is there a way to manually change the energy of a particle?
Not quite sure what you're asking, but here's an idea.
If you have an energy eigenstate, that suggests your particle is confined. If you shrink the "box" it's in, that increases 𝜈 and raises the ener …
- 21.7k
2
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Free electron absorbing energy from electromagnetic radiation: Classical and Quantum pictures
We draw a distinction between absorption and scattering. Classically, if you illuminate an isolated electron with an electromagnetic wave, it oscillates. An oscillating electron radiates electromagnet …
- 21.7k
1
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What are the main differences between metastable and virtual intermediate states?
A virtual state is the result of an externally applied field. Take away the field, there's no virtual state. But a metastable state persists even if the field that excited it is removed.
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0
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Redshift of gamma-Ray burst
We measure gamma-ray burst redshifts in the optical or near infrared range. That's where the spectral lines are. We presume, on solid theoretical ground, that the redshifts at longer and shorter wavel …
- 21.7k
1
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Could nonlinear quantum mechanics be found by future quantum computers?
No. Models are not fundamental. A quantum computer can, in the end, tell you only about the properties of the model it computes. It cannot tell you whether that corresponds to reality. You need an exp …
- 21.7k
0
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Scattering theory - is it not possible to have inward waves?
In a scattering problem, the incoming particle comes from some direction, so we model it with a plane wave. The outgoing particle goes (with some probability) in any direction, so we model it with an …
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3
votes
Accepted
Does photoelectric effect occur at stopping potential?
In a vacuum photodiode, which I believe is your context, the photocathode emits photoelectrons regardless of the anode potential. However, if anode potential exceeds the stopping potential, the photoe …
- 21.7k
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With the tunnel effect, because matter travels through solid matter, why wouldn't teleportat...
Tunneling is a wave phenomenon, and it's less profound than you think. When a wave enters a region of space where it cannot propagate as a traveling wave, it propagates as an evanescent wave: it keeps …
- 21.7k
0
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Why can we distinguish two electrons in different experiments?
As you say, this is an experimental fact. It's the way the universe (sometimes) works. This fact constrains the theory.
The way the theory deals with this is that you may effectively distinguish the e …
- 21.7k
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Why doesn't a photon state have to be infinite in length?
It's very simple: we say that photons are localized because a real physical photon detector registers the arrival of a photon at a particular place and time. That's fundamental: the math is stories ab …
- 21.7k
2
votes
Accepted
Is it possible to Compton scatter from delocalised pi-electrons in liquid scintillator?
Yes. Most laboratory "Compton scattering" isn't from free electrons, but from bound electrons whose binding energies are small compared to the photon energy. Your pi electrons certainly qualify when i …
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4
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Does science have evidence that the simulation hypothesis is true?
There is no such evidence, and it seems insane to me. Simulation is hard. It takes a massive amount of supercomputer time to accurately simulate even very simple physical systems, while even complicat …
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1
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Why is light with higher frequency more destructive, if it emits the same amount of electrons?
For a complex mixture of chemical compounds, a lot of things happen.
Photochemical reactions may occur without ejecting electrons from the compounds. They are, however, similar to the photoelectric e …
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8
votes
Is Bell's Theorem Wrong?
Bell's Theorem is fine mathematics, but the universe is under no obligation to agree with it. Mathematics is not physics.
The idea that we use to capture the actual phenomenon is that once you have me …
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3
votes
Why do particles of a real gas have intrinsic random motion even before to collide with each...
It's a model. The random motion is an assumption of the model. If it's not a decent approximation, the model won't reflect the physics.
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