Negatively charged particle with spin 1/2. A component of mundane terrestrial matter, and part of all neutral atoms and molecules. It has a mass about 1/1800 that of a proton. Its antiparticle is the positron.
Questions tagged [electrons]
3324 questions
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How fast do electrons travel in an atomic orbital?
I am wondering how fast electrons travel inside of atomic electron orbitals. Surely there is a range of speeds? Is there a minimum speed? I am not asking about electron movement through a conductor.
Fred
- 411
17
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4 answers
How do electrons flow in AC?
Electrons flow from low potential to high potential in DC, i.e. from negative terminal to positive terminal.
But how do they flow in AC, as the polarity changes every 10ms for 50Hz?
Vivek
- 171
8
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1 answer
What makes electrons lose energy?
As far as I know from physics lessons I got at school, electrons go up to higher energy levels when they capture a photon. But, once an electron is at a given level, what makes it go down to a lower level and emit a photon? Is there a constant time…
Claudi
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3 answers
Electrons in CRT
In a CRT, where do the ejected electrons go after they cause fluorescence on the screen, have they lost most of their energy, or do they actually go through the glass?
aonin
- 81
4
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6 answers
Effect of a magnetic field on cathode rays in a cathode ray tube
My question is regarding the direction in which cathode rays bend in a magnetic field.
My book states that :
When only electric field is applied, the electrons deviate from their
path and hit the cathode ray tube at point A. Similarly when only
…
Ashok Sharma
- 239
4
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1 answer
Diagonalizing the Hamiltonian of the two-site Hubbard model
The Hamiltonian for the two-site Hubbard model is as follows:
$H = - t \sum_{\sigma = \uparrow, \downarrow} (c_{1\sigma}^{\dagger} c_{2\sigma} + \text{h.c.}) + U \sum_{i=1,2}n_{i\uparrow}n_{i\downarrow}$
For homework, I need to diagonalize this…
Kappie001
- 205
4
votes
5 answers
Where do free electrons come from?
Here's what I what to know... Atoms have a nucleus that's positively charged and the negative electrons flow around it. Well when you pull the negative electrons off the atom where do the new electrons come from? Why does copper not ever run out of…
3
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2 answers
Electron revolving in an atom
When an electron revolves around the nucleus in P or d-orbitals why does not it collide with the nucleus.
I mean to say that the shape of the orbital narrows near the nucleus , so shouldn't it collide with the nucleus?
M.Tarun
- 435
3
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1 answer
What was the conclusion of Plucker's maltese cross for cathode rays experiment? And why is a sharp shadow produced?
I understand that Plucker showed that cathode rays travelled in straight lines, but what was his conclusion? From what I understand, it didn't conclusively supported a wave or particle model, but I have heard conflicting things where some people say…
physicsphil
- 521
3
votes
1 answer
Why wouldn’t electrons in a CRT just get attracted to the accelerator anode?
I was wondering how the accelerator and focus anode in a CRT don’t attract electrons but they just focus and accelerate it? Why don’t electrons stick to it if they have a high potential?
user3407319
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what causes an electron to jump out of its orbit?
I was just wondering for an assignment what causes an electron to jump out of its own orbit. I hope someone could help me with this question.
Avery Howard
- 39
3
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1 answer
A single electron (and positron) annihilation, is my face melted?
To help clarify my understanding of scale in regard to microscopic particle energy levels (specifically, an electron), I came up with this thought exercise:
What would happen if an electron and a positron annihilated one meter in front of my face? …
2
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2 answers
Experimental result of the atomic nucleus volume by scattering alpha particles from the atomic nucleus. Investigation of the electron volume by what?
Rutherford's alpha particle experiments marked the beginning of the determination of the volume of the atomic nucleus.
How were the experiments conducted that led to the statement of the point-like electron?
HolgerFiedler
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2
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2 answers
How were the oil drops in the millikan oil drop experiment negatively charged?
In this picture(all others on google are the same), the positive plate is at the top and the negative plate is on the bottom. This means for this experiment to make any sense, the oil drops must be negatively charged. If this is the case, then why…
jamie
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Oscillating electron in the orbitals
Let us take in our case a hydrogen atom with one proton and an electron in 1s orbital.
Now let us hit that electron with exactly only one ray of photon (Imaginary, don't know whether it is possible in reality) of frequency that would make the…
Kawin M
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