All Questions
19
questions
6
votes
1
answer
503
views
How do neutron stars emit black body radiation?
If my understanding is correct, black body radiation is emitted by a substance due to the substances coupling with the electric field. The negatively charged electrons in atoms for example can couple ...
- 71
0
votes
1
answer
250
views
Why do photoelectrons from a vacuum photocell move towards the collector plate if it is not charged? Has it been charged beforehand?
Why do photoelectrons from a vacuum photocell move towards the collector plate if it is not charged? Has it been charged beforehand, or do they simply move forwards because of the kinetic energy they ...
- 799
6
votes
6
answers
1k
views
How exactly does an electron falling back to its original state from an excited state produce electromagnetic waves?
TL;DR
Alternating currents create EM waves, that is quite clear.
But why do electrons falling back to their original state create EM waves?
Is there are clear explanation like alternating currents? ...
- 371
17
votes
4
answers
3k
views
Why do electrons tend to be in energy eigenstates?
An oft cited problem with the planetary model of hydrogen is that, if the electron were in fact classically orbiting the proton, then it would radiate away all of its energy and fall into the nucleus. ...
- 1,590
1
vote
1
answer
167
views
Photoelectric effect in space floating metal
I have read this question:
Electrical neutrality in photoelectric effect
Now the answer by HiddenBabel says:
Metals are conductors. As electrons escape, new electrons easily flow from ground ...
- 29k
14
votes
4
answers
18k
views
Why do atoms emit a certain colour of light? (The emission spectra)
We were taught about the emission spectra in class last year, but my teachers couldn't give me an answer to 'what determines the colour of light emitted?'. (they were giving me the answers to the ...
1
vote
1
answer
254
views
What produces higher frequency light?
I don't know much more than the basics of the theory, so if my question stops making sense at some point, an answer addressing that would be awesome.
From what I understand so far, photon creation ...
- 3,075
1
vote
0
answers
577
views
Why don't atoms constantly emit light? [duplicate]
We know that accelerating charged particles emit electromagnetic radiation. We also know that electrons around nucleus have an angular momentum which means that electrons are revolving around the ...
- 11
1
vote
1
answer
88
views
Why electron moving with acceleration around nucleus is not emitting EM-waves? [duplicate]
I know that physics (beginnig with Bohr) say that while an electron is in any orbit (whle not jumping from orbit to orbit) it is not radiating EM-waves. But an electron in any orbit (even maximum ...
- 131
-1
votes
1
answer
279
views
How is energy conserved in spontaneous emission?
I was reading through the section on spontaneous emission in Introduction to Quantum Mechanics (2nd Ed.) by Griffiths. In section 9.2.2 he explained that spontaneous emission is really a stimulated ...
- 434
2
votes
0
answers
53
views
Physical source of photon frequency [duplicate]
In QM it's taught that the frequency of a photon emitted when an electron drops from a higher-energy state to a lower-energy state is $\Delta E/h$. In E&M, it's taught that the source of an ...
- 24.8k
1
vote
2
answers
439
views
Does an electron release energy while roaming around the nucleus? [closed]
Does an electron release energy while roaming around the nucleus in a single energy level? I don't really get why the Rutherford theory that the electrons are orbiting around the nucleus is rejected.
- 37
3
votes
0
answers
110
views
Why don't electrons in atoms radiate away their energy? [duplicate]
I am aware this question has been asked before, but I am looking for a more technical answer than those given to the other questions.
I am aware the question in the title is a problem in classical ...
- 787
0
votes
1
answer
128
views
Is frequency of K alpha X-ray different for isotopes of the same element?
I was thinking that the isotope with more massive nucleus will cause an extra energy gap, due to extra gravitational field, between n=2 and n=1 shells. Even though, the effect will be minuscule, it ...
- 121
1
vote
2
answers
166
views
Why is the energy expressed in an electron orbital change of state electromagnetic (photon)? [closed]
As I understand it, Schrodinger's wave equation predicts the allowable energy states an electron can have under the electromagnetic forces of a given nucleus (and I assume other 'orbital' electrons). ...
