How where auroras explained before Eugene Parker's theory of solar winds? |
- How where auroras explained before Eugene Parker's theory of solar winds?
- Can something be too cold to burn?
- Why do electrons have discrete energy levels they can occupy, and jump from between orbitals, yet do not revolve around the nucleus in orbits?
- What do the amplitude and frequency of a single photon actually represent?
- Are bee populations STILL declining?
- Has Io ever been seriously considered a possible site for extraterrestrial life?
- Why does light bend when it refracts?
- Why/How does heavy doping cause a thinning of quantum tunneling barrier in semiconductors?
- If the universe is 13,7 bilion years old, stars burn for 4-5 billion years and supernovae birth new stars along with most elements, how is it that the atoms in our bodies (for instance) have been through many stars, as opposed to just 2 or 3?
- Are our pinky and ring fingers mechanically linked?
- Could a satellite gather molecular gases from orbit to maintain its orbit?
- Can someone explain the channel polarization in polar codes?
- Are tritium illuminated watches truly safe to wear when bremsstrahlung is considered?
| How where auroras explained before Eugene Parker's theory of solar winds? Posted: 16 Aug 2018 02:29 PM PDT I read that Parker's theory about the existence of solar winds was met with controversy since the predominant consensus back then was that space was a complete vacuum. So how did they explain auroras (that are caused by charged particles carried by solar winds interacting with our magnetosphere)? [link] [comments]  |
| Can something be too cold to burn? Posted: 16 Aug 2018 09:34 PM PDT If we want to put out a stack of sticks from our lawn, removing the fuel or oxygen is pretty easily done. Simply take away the unburned sticks or smother the fire with sand, a blanket, etc. What about denying the fire heat, though? Without changing the amount or availability of the fuel or oxygen, like introducing compressed (and cooled) carbon dioxide, is it possible to steal enough heat from the fire to make it quit burning? If this is possible, I suspect it would have something to do with slowing the atoms to the point the fire can no longer sustain itself, but for some reason it doesn't coalesce into a consistent process in my mind. Sorry if this is too elementary for this sub. I actually have a decent understanding of different sciences (physical science, physics, astronomy, a little chemistry, etc), but this explanation has always eluded me. [link] [comments]  |
| Posted: 16 Aug 2018 11:59 PM PDT In class, I learned about the Bohr's model, which introduces the concept of discrete energy levels that electrons can occupy. However, Bohr's model is not accurate anymore as it only applies to the Hydrogen atom, hence debunking the fact that electrons move around the nucleus in fixed orbits, and instead exists in probability clouds. In this case, how do discrete energy levels exist when fixed orbits do not exist? How do electrons 'jump' from orbit to orbit during excitation/relaxation if there aren't fixed radii of orbits for them to jump to? How do electrons even revolve around the atom then? I'm so confused, and I think I've got something misunderstood. [link] [comments]  |
| What do the amplitude and frequency of a single photon actually represent? Posted: 17 Aug 2018 03:55 AM PDT In the classical view, light is the combination of an electric wave and a magnetic wave going up and down in phase. Here, what is going up and down is the square root of intensity of the electric and magnetic wave. So we clearly know what the amplitude and frequency represent. The photoelectric effect proves that the classical EM wave theory of light is incorrect. Light exists in the form of particles / wave-packets called photons. These photons also have wave-like properties. Unlike previously theorized, the energy carried by light isn't given by the intensity of its wave but by the frequency of individual photons. From my understanding, this is what I infer: If something is wave-like and has a frequency F, then something (X) is moving up and down at that frequency. If something is moving up and down at a frequency, then there is obviously amplitude involved. This represents "by how much X has moved up or down at a certain point". Let's call this A. In the classical view, X was a measure of energy or intensity. And A gives the value of X at a point in time. And F was a measure of how quickly this intensity went up and down. Let's get to the quantum, modern view. According to the double slit experiment's results, photons land on the screen at random positions forming an interference pattern. This pattern seems to be the result of two radial wavefronts starting from the two slits. Now, if the interference pattern is represented by a wave function, then this would give us that X for a photon is the probability of it landing at that point of space. This would mean that the frequency F of a photon measures the speed at which this probability moves up and down, which makes no sense to me. How does a shifting probability value give rise to colors (since colors are just photons at different frequencies)? Does this mean that when I see blue, it's because the probability of a photon hitting my eye is oscillating at 650Hz!? Sorry if I seem dumb. [link] [comments]  |
| Are bee populations STILL declining? Posted: 17 Aug 2018 07:04 AM PDT I've seen some mixed reports in the slog of mainstream media. Some say they're bouncing back a little, and some appear to just have learned of the epidemic and are entering panic mode. Are they still in trouble, or is there hope? [link] [comments]  |
| Has Io ever been seriously considered a possible site for extraterrestrial life? Posted: 16 Aug 2018 05:37 PM PDT In Arthur C. Clarke's "2010", humanity finds extraterrestrial life for the first time on Jupiter's moon Io. In the years since, I can't recall any "real" cases for Io being a likely spot to find life in our solar system other than Earth. Has Io ever been a serious candidate for finding life? If not, why did Clarke choose it for his novel? [link] [comments]  |
| Why does light bend when it refracts? Posted: 16 Aug 2018 01:57 PM PDT I've looked everywhere and this is driving me crazy, so hopefully someone here can help me. I'm curious as to why light bends during refraction. I understand that when it travels from one medium to another, its speed changes, which is responsible for the refraction. What I don't understand is why this change in speed causes the light to change directions. Why wouldn't the light just pass through the medium, heading in the same direction, but at a slower (or faster) speed? Wikipedia gives the following analogy: "Imagine a marching band as it marches at an oblique angle from a pavement (a fast medium) into mud (a slower medium). The marchers on the side that runs into the mud first will slow down first. This causes the whole band to pivot slightly toward the normal (make a smaller angle from the normal)." In this case, why must light (the marching band) change it's course of motion because of the new angle cause by the slowing down of one side? Why doesn't the light just keep heading straight, but have a weird slant in the front instead of a straight line? I hope this makes sense, please ask if I need to clarify anything. Thanks for the help in advance. [link] [comments]  |
| Why/How does heavy doping cause a thinning of quantum tunneling barrier in semiconductors? Posted: 16 Aug 2018 08:26 PM PDT I know that heavy doping causes the barrier between a metal contact and a semiconductor (say silicon) to become thinner. But, I am not clear on the details of how or why this should happen.... Is it because there is some number of electrons that have to move to the metal side to balance out the junction, and the heavy doping allows this number to be reached in a thinner area? Any light you can shed on this problem would help me out! [link] [comments]  |
| Posted: 17 Aug 2018 03:38 AM PDT |
| Are our pinky and ring fingers mechanically linked? Posted: 16 Aug 2018 06:33 PM PDT I can put my ring finger down by itself, no problem. But whenever I try to put my pinky down, the ring finger wants to come along with it. Why is that? How come it doesn't work vice versa? [link] [comments]  |
| Could a satellite gather molecular gases from orbit to maintain its orbit? Posted: 16 Aug 2018 01:37 PM PDT Assuming the power and technology to actually do it, are there enough gas molecules in the various orbit distances to be collected, compressed, and used as thrust to maintain speed and attitude to continuously hold orbit forever? I know the satellite's orbit and mass would matter a lot, but is it even possible at any scale? [link] [comments]  |
| Can someone explain the channel polarization in polar codes? Posted: 16 Aug 2018 08:58 PM PDT I am currently studying Polar Codes in 5G, but I do not quite understand how the algorithms work except from the concept that it aims to approach Shannon capacity by using N copies of a channel to seperate them into either complete noise or noise free. Thank you [link] [comments]  |
| Are tritium illuminated watches truly safe to wear when bremsstrahlung is considered? Posted: 16 Aug 2018 10:26 AM PDT Manufacturers of these GTLS (gaseous tritium light source) watches love to claim that they are completely harmless because the beta decay of Tritium cannot penetrate intact skin. They never mention the X-ray emission caused by bremsstrahlung - the reaction between the phosphorus and tritium. Having an always-on low energy x-ray source strapped to your wrist can't be safe... can it? [link] [comments]  |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
No comments:
Post a Comment