Tagged Questions
1
vote
0answers
49 views
Where do electrons get the energy to remain in orbit? [duplicate]
As we know electrons continuously revolve around the nuclus without falling in it at a high velocity beating it's force of attraction. My question is where do electrons get energy to revolve around ...
5
votes
3answers
307 views
Particle coming across a step potential barrier
My quantum mechanics textbook says that when a particle (in the classical case) comes across a potential-step barrier of finite height, if it has sufficient energy to surmount the barrier, it will ...
7
votes
3answers
313 views
Force through quantum mechanics
In classical physics force is:
$$F=\frac {dp}{dt}$$
How about quantum mechanics?
In Old Quantum Mechanics momentum is: $p=\hbar \cdot k$ so force will be:
$$F=\hbar \frac {dk}{dt}$$
what does $\frac ...
7
votes
5answers
274 views
Why don't we use the concept of force in quantum mechanics?
I'm a quarter of the way towards finishing a basic quantum mechanics course, and I see no mention of force, after having done the 1-D Schrodinger equation for a free particle, particle in an ...
0
votes
0answers
168 views
Force of a particles on a Potential Barrier [closed]
A particle confined by a potential wall exerts some pressure on it. More specifically, suppose that the particle moves in this potential:
$$V(x) ~=~\left\{ \begin{array}{lcc}\text{finite ...
1
vote
1answer
264 views
Force exerted on potential wall
A particle bound in an infinite potential wall at $x=0$ will apply a force on the wall. For a plane wave and imagining it as a fluid bouncing off the reflection wall at $x=0$, find the force in terms ...
-3
votes
1answer
57 views
Assuming collision , are there fundamental forces associated with absorbtion?
I just learned that strong and weak nuclear forces relate to decay/emission.
I know absorbtion depends on Energy levels(QM) and heat(thermodynamics , kinetic energy , entropy) and E = gamma mc^2 ( ...
4
votes
3answers
341 views
What keeps particles in an atom from flying away or falling into the nucleus?
In atoms, what force or charge, etc. keeps particles from flying away or into their nucleus? is there a kind of weak-force at work on the atomic scale?
Note I am aware the particle positions are ...
16
votes
4answers
531 views
Particles for all forces: how do they know where to go, and what to avoid?
Here's an intuitive problem which I can't get around, can someone please explain it?
Consider a proton P and an electron E moving through the electromagnetic field (or other particles for other ...
6
votes
1answer
358 views
Degeneracy Pressure, What is it?
There has been numerous question, some violent even in physics@SE regarding PEP and EM forces.
But what baffles me is what is degeneracy pressure? I know there are 4 fundamental forces- EM, gravity, ...
