If I put a flashlight in space, would it propel itself forward by "shooting out" light? |
- If I put a flashlight in space, would it propel itself forward by "shooting out" light?
- A woman with a long history with major chemical corporations told me yesterday that CO2, Diamonds and Pencil Lead were Organic, is she right?
- Why does silver have a really high coefficient of friction with itself, but low when it has friction against other materials?
- How can polarizations other than linear and circular exist?
- What are the advantages of solid state waveguide lasers over diode lasers?
- Could a beam of positrons directed at an atomic structure eventually cause the atoms to break apart due to electron/positron annihilation?
- Can someone explain the octet rule?
- Do spherical harmonics, used to describe the electron distributions of atomic orbitals, find other uses in fields other than physics/ chemistry?
- What is the Quantum Field Theory?
- Could the Chicxulub asteroid impact possibly have pollinated nearby planets/moons through panspermia?
- In accelerators are elementary particles created from the energy of the collision or the proton somehow breaking apart?
- Why do planets and moons tend to have orbits within a single plane, whereas some galaxies are relatively globular?
- Is it possible to have a magnet where 100% of the domains point towards the same direction?
- How dangerous is it to handle Tritium?
- Why is the Cape floristic region so small, what makes it a separate floristic region from the rest of South Africa, and why are there no similarly small regions elsewhere?
- Genetics: Is The Only Way for a Man to Make a Detectable Genetic Contribution Through Successive Generations is to Have a Son, and A Woman to have a Daughter?
- What impact does our diet have on climate change?
- Does a van de graaf generator make you positive or negative?
- Why are melanocytes found in the heart and bones?
- What is "silicone" cookware made of? Isn't silicone a silvery, crystalline metal?
- How do vibrations without changes in dipole moment occur?
| If I put a flashlight in space, would it propel itself forward by "shooting out" light? Posted: 23 Sep 2016 05:18 AM PDT |
| Posted: 23 Sep 2016 06:12 AM PDT Now to Clarify I work with this woman, L (chemist with history at major chemical producers) I'm in the IT Department, we had dinner last night with another colleague (PhD environmental biology). Now during the meal they were chatting chemistry and L's work history and such, I wasn't paying full attention because I don't know anything about chemistry. But basically it came up that anything that contains Carbon is organic. So, being curious I asked L if a diamond would be organic. She says yes, anything that contains carbon is organic. I ask if there's a difference between the term "organic" to a chemist as opposed to a biologist, she replies that "organic is just a Marketing term" but doesn't really answer my question and just acted a bit condescending about the fact that I don't have a chemistry background. I asked a friend of mine who took high school chemistry and he said he'd never heard of it and that I should ask her if CO2 is organic, she says it is... So my question, because she was rude and I wasn't interested in asking again, is
I had learned that organic meant that it was an organism, that it had lived at some point or another. TL;DR: My coworker told me that any carbon containing compound is organic, but I always learned that organic meant that it was once living. [link] [comments]  |
| Posted: 22 Sep 2016 02:26 PM PDT |
| How can polarizations other than linear and circular exist? Posted: 22 Sep 2016 07:31 PM PDT I'm specifically curious about elliptical polarization. If my understanding of this is correct (and it may not be) photons must travel with their e and b fields perpendicular to eachother and to the direction of travel. This would make circular polarization equivalent to a rotating (along the axis of propagation) photon and linear polarization equivalent to a non-rotating photon. I was also under the impression the ratio of the e and b fields is a constant. How are elliptical polarizations possible? Are one or more of the above incorrect? [link] [comments]  |
| What are the advantages of solid state waveguide lasers over diode lasers? Posted: 23 Sep 2016 01:24 AM PDT I've been hearing a lot of talk about waveguide lasers in the past years, but in what cases are they better than diode lasers? You need a diode laser to pump them anyway, right? [link] [comments]  |
| Posted: 22 Sep 2016 11:23 AM PDT |
| Can someone explain the octet rule? Posted: 23 Sep 2016 01:16 AM PDT I just attended a chemistry lecture about electrons and the periodic system (Basically just repitition). Long story short: My teacher either both denied and confirmed the octet rule in a span of about 10-15 minutes, or I have completely misunderstood the octet rule. We were talking about potassium and its electron configuration and we determined that the configuration is 2,8,8,1. Then he asked if anyone could tell him why the N shell electron didnt stay in the M shell, since there technically is space for it. I said that valence shells cannot have more than 8 electrons (which, to my understanding, is the octet rule). He said that this was wrong. A while later we'd gone onto valence electrons, and since I was still convinced that there can be cannot be more than 8 valence electrons, I brought this up. At that point he said that valence shells can hold between 2-8 valence electrons, but no more, and denied saying otherwise. I still don't understand what I've mistaken about this. Can someone clear this up? [link] [comments]  |
| Posted: 23 Sep 2016 08:11 AM PDT I feel like they would be used in areas of engineering (such as propagation of waves on a spherical surface?) but I couldn't find anything to go on. Maybe I'm wrongly interpreting what they actually are. The wikipedia pages don't shed any light on their history/ 'discovery'. [link] [comments]  |
| What is the Quantum Field Theory? Posted: 23 Sep 2016 08:05 AM PDT |
| Posted: 22 Sep 2016 08:56 PM PDT |
| Posted: 23 Sep 2016 02:57 AM PDT (edit: When I mean "breaking apart" that the proton is "busted" into its constituent bits?) [link] [comments]  |
| Posted: 22 Sep 2016 02:46 PM PDT |
| Is it possible to have a magnet where 100% of the domains point towards the same direction? Posted: 22 Sep 2016 10:40 AM PDT Like how you can reorganize which direction the atoms in a screwdriver face with a magnet. Is it possible to reorganize all of the atoms such that every atom faces towards the same direction? Can it occur naturally? [link] [comments]  |
| How dangerous is it to handle Tritium? Posted: 22 Sep 2016 01:08 PM PDT If tritium was spilled on exposed skin, is it an immediate trip to the hospital? For context, I'm asking the question because I recently purchased jewelry with tritium vials inside of it and was curious of the potential risks if the vial ever broke on me. [link] [comments]  |
| Posted: 22 Sep 2016 08:06 AM PDT |
| Posted: 22 Sep 2016 10:10 PM PDT In studying genetics, it seems there are basically three standard variables of significance. The most obvious is mutations that endow an organism with enhanced reproductive success. The other two variables, on the other hand, are about continuity: that is, two fairly permeant aspects, that while they reflect past mutations, act as the twin pillars of conservation and inheritance, namely: the y chromosome and mitochondrial DNA. Men and women are often said to have different reproductive strategies. But, underlying that, is there a broader question? That is, for a women to be able to have made a detectable genetic contribution to her descendants in say, 6 generations, does not that require that she have daughters, who have daughters, who have daughters. That is, her largest genetic imperative rests on the reproduction of women more than sons if she is to maintain her detectable genetic signature in successive generations. Is this not also true for men, who to maintain a detectable link to their descendants, require that they have sons, who have sons, who have sons, etc. Men are related to each other on the test by virtue of their haplogroup. Women are related to each other by virtue of their mitochondrial DNA. Over a succession of generations, is if fair to say that the only way to really link people genetically to an identifiable ancestor is through these two stable genetic markers. Or at least, the most stable. All other parties, such as a man who has a daughter or a woman who has a son, certainly also contribute genetic information to their progeny. But might we not interpret that contribution as a more haphazard process, as part of a wider 'genetic lottery' of random assortment that serves to 'play roulette' and, by chance, come upon the next, mutated haplogroup or mitochondrial group that produces outsized reproductive advantages? We see a child as being a basically a 50/50 reflection of both parents. But, beyond the basic reproductive differences between men and women (men can have a thousand children, women only a dozen), does the sex of a child have a direct impact on the ability of the male or female to maintain a detectable genetic signature--in a sense, to more clearly reproduce its unique genetic markers? [link] [comments]  |
| What impact does our diet have on climate change? Posted: 22 Sep 2016 08:56 AM PDT How much does our diet effect climate change? I've read avoiding beef makes a difference, what about pork and poultry/eggs? Is the impact of dairy cows the same as those I get my tasty steaks from? [link] [comments]  |
| Does a van de graaf generator make you positive or negative? Posted: 22 Sep 2016 03:44 PM PDT I'm really hoping for some sources here if possible. I've been taught using van de graaf generator that the belt is taking away electrons from the dome and whatever is in contact with the dome. Which I thought would leave the dome positive and you positive, making Hair repel from each other. Recently some stuff I read said it was adding electrons to the dome, making it negative charge. I've done research and seem to be finding both answers the more I dig, even while searching site:edu Can any one help me out with an answer and a solid source where I can see this explanation. Thanks so much [link] [comments]  |
| Why are melanocytes found in the heart and bones? Posted: 22 Sep 2016 09:36 AM PDT I know the function of melanocytes in the epidermis, but why are they found in deeper tissues? [link] [comments]  |
| What is "silicone" cookware made of? Isn't silicone a silvery, crystalline metal? Posted: 22 Sep 2016 09:01 PM PDT |
| How do vibrations without changes in dipole moment occur? Posted: 22 Sep 2016 11:16 AM PDT I'm confused. Here's what's confusing me: If a molecule only changes its vibrational state when it absorbs energy. And it can only absorb energy from radiation when it leads to a change in the molecule's dipole moment, how the shit do vibrations that don't lead to changes in the dipole moment occur? I actually have more questions on this but I'll start here. [link] [comments]  |
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