Timeline for Why can visible light go through green-house gases? [duplicate]
Current License: CC BY-SA 4.0
15 events
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| Dec 26, 2019 at 20:19 | comment | added | Hooman Bahreini | @G.Smith: if you say something like: "are you familiar with quantized energy levels of an atom?" then sure... but if you explain something and say "Do you understand this explanation?" then it's different. | |
| Dec 26, 2019 at 11:49 | comment | added | G. Smith | This site gets questioners with many different levels of knowledge. When I ask someone on this site “Do you understand X?”, it is not a putdown but an attempt to understand how to provide an appropriate level of answer. | |
| Dec 26, 2019 at 11:47 | comment | added | G. Smith | @HoomanBahreini I am very sorry to learn that you construed my comment as hostile or elitist. It was certainly not intended to be either. I was trying to gauge what you already understood about how atoms interact with photons. Energy level differences in greenhouse gases are such that they easily interact with infrared photons but not with visible photons, using the formula $\Delta E=hf$. | |
| Dec 26, 2019 at 6:28 | comment | added | Hooman Bahreini | @G.Smith: I have read your comment a couple of times over the past month and finally decided to recommend you to read this blog, which is about all Stack Exchange sites: Too many people experience Stack Overflow¹ as a hostile or elitist place, especially newer coders, women, etc... | |
| Nov 30, 2019 at 6:55 | history | edited | Qmechanic♦ |
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| Nov 30, 2019 at 6:43 | comment | added | Hooman Bahreini | @JohnRennie: thanks a lot... So does it mean that visible light has too much energy? I assume excite means that an electron absorbs energy and jumps to higher level? So an infrared light has just the right amount of energy for this to happen, whereas visible light has too much energy so it cannot be absorbed? | |
| Nov 30, 2019 at 6:40 | history | duplicates list edited | John Rennie | duplicates list edited from How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun?, How do greenhouse gases trap heat?, Explain it to me like I'm a physics grad: Greenhouse Effect to How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun?, How do greenhouse gases trap heat?, How does heat actually stay kept in the carbon molecules in the atmosphere? [duplicate], Explain it to me like I'm a physics grad: Greenhouse Effect | |
| Nov 30, 2019 at 6:39 | history | duplicates list edited | John Rennie | duplicates list edited from How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun?, Explain it to me like I'm a physics grad: Greenhouse Effect to How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun?, How do greenhouse gases trap heat?, Explain it to me like I'm a physics grad: Greenhouse Effect | |
| Nov 30, 2019 at 6:38 | history | duplicates list edited | John Rennie | duplicates list edited from How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun? to How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun?, Explain it to me like I'm a physics grad: Greenhouse Effect | |
| Nov 30, 2019 at 6:38 | history | closed | John Rennie visible-light Users with the visible-light badge or a synonym can single-handedly close visible-light questions as duplicates and reopen them as needed. | Duplicate of How does carbon dioxide or water vapour absorb thermal infra red radiation from the sun? | |
| Nov 30, 2019 at 6:36 | comment | added | John Rennie | @HoomanBahreini $\textrm{CO}_2$ has vibrational transitions at IR wavelengths so an IR photon is absorbed and excites the molecule to a higher energy state. The molecule then spontaneously decays back to the ground state and re-emits the photon in a random direction. | |
| Nov 30, 2019 at 6:20 | comment | added | Hooman Bahreini | @JohnRennie: thanks for your comment. So Co2 (or any other GH gas) absorbs infrared light, and then re-emits the infrared light in a random direction? Are you able to give a little more info about this please? Does Co2 enters an "unstable state" after absorbing the infrared light and that's why it re-emits it again? | |
| Nov 30, 2019 at 6:13 | comment | added | John Rennie | The IR radiation isn't reflected. It is absorbed then re-emitted in a random direction i.e. 50% of the re-emitted radiation on average ends up headed back downwards. | |
| Nov 30, 2019 at 5:44 | comment | added | G. Smith | Do you understand how the quantized energy levels of atoms allow only the absorption of photons whose energies are equal to the differences in energy levels? | |
| Nov 30, 2019 at 5:41 | history | asked | Hooman Bahreini | CC BY-SA 4.0 |