- If elements in groups generally share similar properties (ie group 1 elements react violently) and carbon and silicon are in the same group, can silicon form compounds similar to how carbon can form organic compounds?
- What are virtual particles? How are they theoretically real yet undetectable?
- Why can't we just use regular hydrogen for fusion instead deuterium and tritium?
- Can the electric field in a dielectric inside a capacitor be opposite of the field of the capacitor?
- How common are transuranics in the universe, and are they evenly distributed?
- Astronomers. When does a "Dwarf Planet" become a "Planet?". What size and features must it have?
- If a person with a certain communicable disease dies of it and is buried, do the said pathogens continue to live, multiply and spread in the soil?
- At different temperatures, things are differently attracted or repelled magnetically?
- What does "sp. n." means in a taxon's description?
- In the concept of hybridization of atomic orbitals ,why is the dipole moment of a lone pair away from the nucleus?
- What is the theory behind the general trend of the seebeck coefficient vs temperature curve for thermoelectric materials?
- When you donate blood or let's say an organ to someone, what happens to your DNA in those cells?
- Why do copper IUDs increase intensity or womens' periods?
- What planets have we developed surface maps of?
- Stellar nucleosynthesis and transuranic elements (in theory)?
- If the brain itself has no nerve endings, how do you feel a headache?
- Do insects get an Adrenalin rush or similar when we try to swat them?
- Why are complex logarithms NOT multi-valued for real integers?
- What exactly is soil leeching ?
- If energy output from the Sun is constant, why isn't every successive year a new "warmest year on record" due to climate change?
| Posted: 12 Jan 2019 12:37 AM PST |
| What are virtual particles? How are they theoretically real yet undetectable? Posted: 11 Jan 2019 11:58 PM PST |
| Why can't we just use regular hydrogen for fusion instead deuterium and tritium? Posted: 11 Jan 2019 03:41 PM PST |
| Can the electric field in a dielectric inside a capacitor be opposite of the field of the capacitor? Posted: 12 Jan 2019 12:05 AM PST I had trouble understanding dielectrics and so I tried modelling a capacitor with a dielectric inside and plotting the vector field. Doing this resulted in this image - blue is negative, red is positive and the yellow region is the dielectric. Darker arrows mean a stronger field at that point. Each plane is a line of N point charges, each with charge of Q/N. I start with a Q for the capacitor, and then find the charge of the dielectric's "plates" with Qp = Q * (1 - 1/Er) where Er is the relative permittivity of the dielectric. Then I just plot the dielectric charges and finally calculate the total electric field for each point by adding up the fields from all the charges. From what I've read, the field inside a dielectric should be weaker (which is the case when I make it cover the whole space between the plates, or lower the permittivity very close to that of vacuum), however I didn't find anything which says it can be in the opposite direction, i.e. the field from polarization being stronger than that of the plates. I believe my model is correct, but I don't really have anyone else to ask, so I'd be very happy to hear your opinion. [link] [comments]  |
| How common are transuranics in the universe, and are they evenly distributed? Posted: 12 Jan 2019 12:59 AM PST Since elements up to iron produced by fission in a main sequence star, these are understandably very common in the universe. My question is how common are the higher numbered elements which are produced by fusion in a supernova, particularly the transuranics? Would it be reasonable to assume that the abundance of higher numbered elements has a linear relationship to the size of the supernova that produced them? Is there any way of detecting distant concentrations of transuranic elements, given their relative scarcity? Are we in an unusually rich area of space for these elements, the ashes of some massive supernova, or is the distribution of heavy elements reasonably constant throughout the galaxy? I think the answer has important implications for SETI, given that an argument can be made that complex life relies on the presence of transuranics in a variety of ways. [link] [comments]  |
| Astronomers. When does a "Dwarf Planet" become a "Planet?". What size and features must it have? Posted: 11 Jan 2019 05:10 PM PST |
| Posted: 11 Jan 2019 09:28 AM PST By extension, like how vaccination improves herd health, shouldn't incineration be a preferred mode of disposal of the dead rather than burial? [link] [comments]  |
| At different temperatures, things are differently attracted or repelled magnetically? Posted: 11 Jan 2019 11:38 AM PST I mean magnets attract or repeal the same way at different temperatures? Like 0°C or 20°c or -270°C or at 2000°C? [link] [comments]  |
| What does "sp. n." means in a taxon's description? Posted: 11 Jan 2019 09:32 AM PST I am trying to create Wikipedia articles on some recently discovered animals. One has the name & authority written like " Neobuthus eritreaensis Lowe & Kovařík, 2016 " while the other one has it as "Neobuthus factorio sp. n. " what does that abbreviation mean? I think it means the species is being described in that same paper, so i should write it's authority like Lowe & Kovařík, 2018 but i would like confirmation from someone who understands taxonomy better than me. [link] [comments]  |
| Posted: 11 Jan 2019 05:49 PM PST In NH3 the bond pair of electrons between hydrogen and nitrogen has a dipole moment towards nitrogen but the dipole moment of lone pair of nitrogen atom is away from it. I want to know why this happens ,as the electron is attracted towards the nucleus shouldn't the dipole moment of lone pair be towards the nucleus as the nucleus attracts the electrons. [link] [comments]  |
| Posted: 11 Jan 2019 08:52 PM PST For degenerate semiconductors, I have noticed that the general trend of seebeck coefficient (S) vs temperature curve are similar. It increases from room temperature to a particular temperature at which S saturates, and then it reduces on further increase of temperature. Can anyone help me to understand the theory behind this? I have gone through various published articles on thermoelectric materials, but I could not find any that explained it in layman's term. [link] [comments]  |
| When you donate blood or let's say an organ to someone, what happens to your DNA in those cells? Posted: 11 Jan 2019 02:21 AM PST |
| Why do copper IUDs increase intensity or womens' periods? Posted: 11 Jan 2019 09:24 AM PST |
| What planets have we developed surface maps of? Posted: 11 Jan 2019 07:34 AM PST |
| Stellar nucleosynthesis and transuranic elements (in theory)? Posted: 11 Jan 2019 06:49 PM PST Hi - this is chemistry, physics, cosmology So this question is purely theoretical. When I ask if something is possible, I mean in the absolute sense, mathematically, in theory, not actually known or observed. I've heard that under certain conditions, neutron stars (or even denser objects, if there are any) could produce all the elements. Even transuranic ones, ie element 118 and so on. If this premise is true, does that mean that elements within the island of stability could also be produced? The third tier is that if there are some super-stable transuranic elements, we might one day find them in the cosmos, even if it's just atoms of it. Or am I all wrong? Thanks [link] [comments]  |
| If the brain itself has no nerve endings, how do you feel a headache? Posted: 11 Jan 2019 05:16 AM PST |
| Do insects get an Adrenalin rush or similar when we try to swat them? Posted: 11 Jan 2019 02:18 AM PST |
| Why are complex logarithms NOT multi-valued for real integers? Posted: 11 Jan 2019 09:08 AM PST In my lecture notes, there is a derivation for complex logarithms, which is: ln(z) = ln( reiθ+2niπ ) = ln(r) + i(θ+2πn) , for integer values of n I understand how this suggests that there are an infinite number of solutions to w = ln(z) (due to the periodic nature of complex numbers on an Argand plane), where z is a complex number. There is a portion which describes the case of z1z2, where z1 and z2 are both complex numbers. However, the next line then explains that z1z2 will be multivalued, EXCEPT in the case where z2 is a REAL INTEGER. The derivation (for a real number, k, and general complex number, z) is as follows: zk = ek ln z = ek ln r + ikθ+2nkiπ = rkeikθ My question is, how can we just suddenly ignore the periodicity (ie the "+2niπ" portion of the equation), if we know the exponent is a real integer? Is there something distinct about real integers that separate it from other complex numbers? Would real numbers not display the same periodicity on an Argand plane as any other complex number? [link] [comments]  |
| What exactly is soil leeching ? Posted: 11 Jan 2019 06:55 AM PST So I've lived in the Amazon region of Ecuador for the last 11 years, and I know that the soil is nutrient poor because of soil leeching , however, I've never really learned what this means. I know it has to do with heavy rainfall washing the nutrients out of the soil, but I don't really get what that means, conceptually. Can anyone help with a more thorough explanation of soil leeching? TIA [link] [comments]  |
| Posted: 11 Jan 2019 04:54 AM PST I often wonder why this is so, if the numbers are based on global temperature average. [link] [comments]  |
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