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visits member for 2 years, 9 months
seen 18 hours ago

Jul
28
comment How is this possible that photons are absorbed?
you basically say that electron slices its energy from the photon, passing the rest, low energy photon through. Otherwise, it is curious to know why remaining energy/low energy photon should be absorbed by the receiving atom (rather than the whole body of the molecule/crystal, for instance).
Jul
27
comment How is this possible that photons are absorbed?
Yes, the Doppler boradening seems to be the root the the puzzle. If here were no such fuzzing out of the spectral lines, every atom could absorb your photons. Ok, there are millions of quantum states, which may make your atom not ready to absorb your photon. However, this huge num of electron states is still finite and given millions of atoms (we have per 1 cm of length), it makes it quite likely to find some accepting atoms. Yet, the Doppler broad. is continous! Probability theory says that there is 0 probability to pick specific item in a continous distribution! How can prob. fix it?
Jul
27
comment How is this possible that photons are absorbed?
@creillyucla The whole body and planet also has a collective motion with total KE. Why should we stop at the atom level when we need to separate 1 dollar from 1.33? Can we slice 1.33 photon into 1$ absorbed + 0.33$ fly through photon?
Jul
27
comment How is this possible that photons are absorbed?
@Asher That is interesting because I do not understand how can you dispense me the kinetic energy. The excitation already stands for the kinetic energy, as I understand it. Electron does not have any other energy besides its spectral line/orbital. They teach us that bound electrons have their energy quantized and these acceptable energy levels are called "orbitals". In other words, quantum theory says that there cannot be any kinetic energy for the tip, besides the 1 or 2 dollars. THe orbitals is all that we have, QT says. Therefore what you say is every interesting. It defies QM basics.
Jul
27
comment How is this possible that photons are absorbed?
I do not see how frequency is changed here. I am asking about specific, high-frequency photons converted into black body spectrum. I do not see how your answer clarifies anything here.
Jul
27
comment How is this possible that photons are absorbed?
@john This does not explain anything because excitation I am talking about is excitation of these, atom-bound, electrons. The energy they emit has the same, proper specturm of the energy levels, the one is absorbed. Bound electrons absorb and emit one and the same point spectrum. You cannot explain break down of this specturm by restating it.
Jul
26
comment How is this possible that photons are absorbed?
I am asking why one atom can be absorbed by another atom, even if those atoms are moving at different speeds. The likelihood of excitation is simply maximized when the atoms have the same velocity. What probability has to do with concrete energy levels? If you can buy goods only for 1 or 2 dollars, how can you spend 1.33? What probability has to do with that?
Jul
19
comment Why it is colder in mountains, at high altitudes?
I am familiar with ideal gas laws and can derive T from P. I just wanted to scuttle my delusion about being able to explain everything simply by gravity, which obviously reduces the energy at the altitudes. I could not understand how can you you loose energy but not temperature, which is also an energy.
Jul
18
comment Why it is colder in mountains, at high altitudes?
@DavidHammen It was the only answer, which actually explained my delusion and helped to realize why pressure (body expansion) is important for cooling. I do not see why it is incorrect.
Jul
18
comment Why it is colder in mountains, at high altitudes?
Ok, I have realized that since raising our ball into the sky does not reduce $v^2$ between the molecules if it is solid but it will expand if it is gaseous, effectively slowing down the $v$, and, thus, $E_avg$. N is not necessary here. Those answers with number of collisions were misleading.
Jul
18
comment Why it is colder in mountains, at high altitudes?
That makes sense. I have got the understanding how pressure is involved: the canon ball must expand if there is lower pressure above and this will effectively slow down its constituiting molecules. Can you answer the $E_{avg}$ part, why is N not counted there but we count it when talk about the kinetic energy of gas at altitudes?
Jul
18
comment Why it is colder in mountains, at high altitudes?
Wait, are you saying that molecules are stopped by pressure from higher layers more than from the gravity? Anyway, gravity affects light bodies likewise it affects the large ones. You cannot throw a hammer 5 km up. Same is molecules. They will be stopped by gravity, despite running really fast. At hudrds km/hour they can reach kilometer heights but not much higher. At the same heights we notice considerable change in temperature. As less molecules reach there, the lower are temperatures.
Jul
18
comment Why it is colder in mountains, at high altitudes?
@OlinLathrop You say that you are not attracted to the Earth by gravity because it mostly does not affect the elements of your body because there are other forces which act much stronger.
Jul
14
comment How do we know that fundamental constants don't slowly change in time?
You could also edit the title. Or better did a search before asking. I see 4 topics on the right pane that ask the same questions.
Jul
13
comment If photons have no mass, how can they have momentum?
@dmckee relativity experts do not use the term "relativistic mass" -- Probably, that is the whole problem. Denying relativistic mass, you perpetuate the misconcept that photons have no rest, no relativistic => no mass at all => how does photon have momentum and produce particles then?. Newbies say that they studied E=mc2 assuming that 0.5 MEv photon has 0 mass at the same time just because strong authoritative voice told them photons have no mass. I do not understand why you try to perpetuate this schizophrenia.
Aug
5
comment Why is the sun brighter in Australia compared to parts of Asia?
@Floris Your answer is this is more humidity than pollution so I do not understand which multiplying effect you are talking about. Second, my answer implies that more humidity = more rain = more clear sky whereas less humidity = too-small-for-rain-droplets, which favours the the haze. Finally, you say more humidity = more stuff for the sunlight to penetrate, which if obviously denied by Feynman and even common logic: more water molecules in the air = less air molecules in the air = the same amount of molecules for the photons to traverse. So, humidity is irrelevant.
Aug
5
comment Why is the sun brighter in Australia compared to parts of Asia?
google.ee/search?q=global+dimming, youtube.com/watch?v=gFtjHqYeTSU
Jul
21
comment Optimal speed for the water wheel
I am asking how the airoplane-style turbines achieve the 100% theoretical efficiency rather than anything else. I cannot even think of a question that you are responding to.
Jul
21
comment Why do some hand dryers blow hot air?
This enables to waste more energy. Another reason is that not to make you feel cold.
Jul
21
comment Practical (maybe naive) question on boiling water
@placeholder how does it answer my question? You claim that I am mindless after totally ignored my argument. This is what happens when people spread stereotypes instead of thinking.