Why are certain electrons only excited by specific wavelengths? |
- Why are certain electrons only excited by specific wavelengths?
- Why doesn't neutron reflection cause a fission reaction?
- Statistical physicists, what all do you work on?
- How doesn't neutrino oscillation hurt conservation laws?
- Can nuclear power plants be used to create nuclear weapons?
- Does Moderna already know if its vaccine is successful?
- Can we map and monitor the tectonic plates on the planet and their movements, so that we can predict earthquakes and their intensities before they occur?
- How are the effects of molecules' spatial orientation on reaction kinetics studied?
- Are any elements produced by the sun released into the solar system?
- Why is pH = 7 considered neutral?
- How confirmed reinfection cases?
- If no treatment for Covid-19 has been developed, then why do people still go to the hospital when they're in critical condition and how does it increase the survivability rate?
| Why are certain electrons only excited by specific wavelengths? Posted: 25 Oct 2020 06:35 AM PDT I was reading about why glass is transparent to visible light. The stated reason was that photons of visible light don't have enough energy to kick the electrons within the silicon atoms up to a higher orbital, so they instead pass through the atom. Thinking about this from a chemistry viewpoint, this lines up with what I was taught. But thinking about this from a physics/engineering standpoint, I'm a little confused. Visible light is just an electromagnetic wave with a frequency of several hundred terahertz. Electromagnetic waves being a propogating electric field and magnetic field at 90 degrees to one another. Electrons are influenced by both electric and magnetic fields. So it doesn't make sense to me that an electromagnetic wave of a particular frequency would just be ignored by an electron. Surely even these frequencies that 'don't interact' with the electrons still impart SOME energy, right? Can someone please shed some light on this for me? [link] [comments]  |
| Why doesn't neutron reflection cause a fission reaction? Posted: 24 Oct 2020 07:09 PM PDT So I just stumbled upon the "Demon core" story about the plutonium core going critical via neutron reflection. I was wondering though, why didn't the core undergo a fission reaction when the tungsten carbide bricks were placed around it? Wouldn't it just take 1 single neutron bouncing off the shielding to collide with the mass and cause it to go into fission? To my understanding that's how the atomic bombs in Nagasaki and Hiroshima were detonated. [link] [comments]  |
| Statistical physicists, what all do you work on? Posted: 24 Oct 2020 05:06 PM PDT |
| How doesn't neutrino oscillation hurt conservation laws? Posted: 24 Oct 2020 06:09 PM PDT I heard that electron, muon and tau neutrinos have different resting masses. Let's suppose I generate one electron neutrino in a beta decay (I know it's an anti-electron-neutrino but it's longer to write down.). If I measure all other particles leaving the atom I can be fairly sure about it's energy, momentum and neutrino flavour. I detect it 1000km away and it's a muon neutrino. What happened? How can the momentum and the energy can be conserved at the same time when the resting mass changed? If at the creation I know it's speed was 1000km/s will it arrive to the detector in 1s or more? If it's speed doesn't change where did it get the extra energy from? What energy and momentum will I measure in the detector? I have researcher level background in statistical physics, but I'm not too knowledgeable in quantum stuff. Please keep it as simple as possible! [link] [comments]  |
| Can nuclear power plants be used to create nuclear weapons? Posted: 25 Oct 2020 01:58 AM PDT I think I heard something like that in a video from Kurzgesagt but I don't understand why and how. [link] [comments]  |
| Does Moderna already know if its vaccine is successful? Posted: 24 Oct 2020 02:59 PM PDT I recently read an article in which Moderna's CMO stated he would be "very surprised" if their vaccine was not effective. Since the study has been going on for several months now, wouldn't he already have a pretty good idea? Or are data somehow guarded until the conclusion of the study to protect its integrity? [link] [comments]  |
| Posted: 24 Oct 2020 08:32 PM PDT |
| How are the effects of molecules' spatial orientation on reaction kinetics studied? Posted: 24 Oct 2020 01:00 PM PDT In general chemistry I recall learning that certain spatial orientations of molecules are more favorable for producing a reaction than others. Presumably when two molecules, A and B, are approaching, it is more favorable if the reacting group of A is oriented towards B and vice-versa, rather than the reacting groups being oriented away from each other. This concept sounds reasonable, but how is it experimentally determined? In aqueous solution? In the gas phase? How are the relative orientations of molecules in space determined or manipulated? [link] [comments]  |
| Are any elements produced by the sun released into the solar system? Posted: 24 Oct 2020 06:08 PM PDT Is the only thing the Sun radiating out Radiation and Photon's or is it also radiating out basic elements during Solar mass ejections that could reach Earth? [link] [comments]  |
| Why is pH = 7 considered neutral? Posted: 24 Oct 2020 08:13 AM PDT I was wondering why neutral pH is always considered to be exactly 7. Is the H3O+ and OH- concentration of pure water at room temperature really precisely 10^-7 M? This seems like an incredible coincidence. Wouldn't some seemingly arbitrary constant be more plausible, e.g. 0.97*10^-7 M or 9.94*10^-8 M? [link] [comments]  |
| How confirmed reinfection cases? Posted: 24 Oct 2020 03:37 PM PDT Are reinfection cases actual cases where a person was hospitalized, released after testing negative, then hospitalized again and positive again? Or is it just data in a database somewhere saying x person had a positive test, a negative test, and then a positive test? And if it's this, couldn't it be contributed to false positives? [link] [comments]  |
| Posted: 24 Oct 2020 08:16 AM PDT What is done to the patients there when nothing has been documented to work for treating Covid-19? That's it, thank you in advance for the hopefully good answers [link] [comments]  |
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