Why do larger elements (e.g Moscovium) have such short lifespans - Can they not remain stable? Why do they last incredibly short periods of time?

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• Why do larger elements (e.g Moscovium) have such short lifespans - Can they not remain stable? Why do they last incredibly short periods of time?
• Why does it seem that bird species who live nearest to the equator tend to be the most colourful?
• What determines the proportion of isotopes for an element?
• Effectively, how are nuclear weapons regulated? I remember reading (on here somewhere) that Uranium 238 isn't regulated, but rather the technology of making it into 235 is. Is this true, and how is this achieved?
• Does the hydrophobicity of an objects surface affect the bouyancy of the object?
• Does running through the rain make you more or less dry than walking?
• When you initially experience a “heartbreak,” or something unexpectedly sad, what is the feeling in your chest? Why does it happen?
• Can Light go both ways in Fiber Optic?
• [Engineering] On submarines with diesel engines, when the sub is submerged, where does the exhaust go?
• Am I seeing cosmic microwave background radiation on an ordinary spectrum analyzer?
• How are blocking temperatures related to TRM?
• In an episode of Star Trek: TNG, the ship encounters a society of clones who face a problem of replicative fading. Is this a real problem with cloning where making a copy of a copy could cause genetic defects after a few generations?
• Are vitamin/mineral supplements ever effective?
• Why does the moon rotate at the same rate as it revolves around the earth? Is it a mathematically probable phenomenon?
• What is resonance in chemical bonds?
• Is there any membrane that allows gases to pass but blocks liquids?
• Why is bismuth not toxic like the other heavy metals?
• [Physics] How did we know that matter is made of atoms and how the periodic table was structured centuries before we had the technology to even remotely observe the basic structure of matter?
• How much temperature would I need if I wanted to create plasma out of a common metal(f.ex. iron, steel, copper)?
• [Medicine] Why can’t mesothelioma be cured?
• Ageing while "time traveling"?
• Are there precious resources (ie gold, copper, titanium) on the moon? Would it be possible to mine them?
• How do we know modern chemicals and materials aren't toxic?

Why do larger elements (e.g Moscovium) have such short lifespans - Can they not remain stable? Why do they last incredibly short periods of time? Posted: 16 Dec 2018 02:15 PM PST Most of my question is explained in the title, but why do superheavy elements last for so short - do they not have a stable form in which we can observe them? Edit: Thanks to everyone who comments; your input is much appreciated! submitted by /u/ocbxc [link] [comments]

Why does it seem that bird species who live nearest to the equator tend to be the most colourful? Posted: 16 Dec 2018 05:45 PM PST Or, am I just mistaken? submitted by /u/AndruJorj [link] [comments]

What determines the proportion of isotopes for an element? Posted: 17 Dec 2018 07:14 AM PST For example, Carbon. Why is Carbon-12 99% of all Carbon on earth, while Carbon-13 is about 1%. I can accept that Carbon-14 is uncommon because of its instability, but Carbon-13 is described as stable and natural. submitted by /u/burned00 [link] [comments]

Effectively, how are nuclear weapons regulated? I remember reading (on here somewhere) that Uranium 238 isn't regulated, but rather the technology of making it into 235 is. Is this true, and how is this achieved? Posted: 17 Dec 2018 12:23 AM PST submitted by /u/NowAFK [link] [comments]

Does the hydrophobicity of an objects surface affect the bouyancy of the object? Posted: 16 Dec 2018 07:09 PM PST Will one of two objects break the surface tension of water quicker if the only difference between them is their surface texture? Will one of the two sink faster afterwards? submitted by /u/ForestFungus [link] [comments]

Does running through the rain make you more or less dry than walking? Posted: 16 Dec 2018 06:19 PM PST Lets say I had to run to my car in the rain to grab something. Would running to my car and running back make me more or less wet than if I walked to my car and back? Certainly the time I saved by running would decrease my end wetness over a given distance, but would the additional droplets I encountered laterally while running make me more wet anyway? I imagine it boils down to a matter of how many drops of rain contact me in each given scenario, but I cannot guess which is higher. Help me reddit! ​ fake edit: Plus there is a splash factor as well, running through thick rain would certainly make legs wetter, wouldn't it? submitted by /u/WyreSkeleton [link] [comments]

When you initially experience a “heartbreak,” or something unexpectedly sad, what is the feeling in your chest? Why does it happen? Posted: 16 Dec 2018 01:50 PM PST submitted by /u/paynebr6 [link] [comments]

Can Light go both ways in Fiber Optic? Posted: 17 Dec 2018 01:24 AM PST Can light go both ways in a single fiber optic, does light interfere with light? Would one have to some how give each end a turn so only one end is producing light at any given time? submitted by /u/waspentalive [link] [comments]

[Engineering] On submarines with diesel engines, when the sub is submerged, where does the exhaust go? Posted: 16 Dec 2018 04:58 PM PST submitted by /u/SomeoneFoundMyReddit [link] [comments]

Am I seeing cosmic microwave background radiation on an ordinary spectrum analyzer? Posted: 16 Dec 2018 06:09 PM PST I am an engineering professional and I specialize in RF. I use RF spectrum analyzers often at microwave frequencies, and there is always a noise floor displayed (HP, Agilent, Keysight equipment, etc.). There's always some kind of minor variation in power at the bottom of the display. Is the noise I'm looking at part of the cosmic background? I do know it appears at all frequencies, but I was just interested to know. It's not terribly important but I would think it was incredibly cool if that's really the cause of the noise, it would link my every day work to the wonders of the cosmos :) submitted by /u/ghamburg [link] [comments]

How are blocking temperatures related to TRM? Posted: 17 Dec 2018 05:45 AM PST From what I understand, Thermoremanent Magnetism occurs during cooling of igneous rocks. However, it is stated in multiple sources that a blocking temperature (or lower temperatures) causes magnetic moments to be blocked, and superparamagnetic material to lose its preferred direction of magnetization. Does this mean that Natural Remanent Magnetism in igneous rocks discontinue once cooled to normal surface temperature? submitted by /u/Krampog [link] [comments]

In an episode of Star Trek: TNG, the ship encounters a society of clones who face a problem of replicative fading. Is this a real problem with cloning where making a copy of a copy could cause genetic defects after a few generations? Posted: 16 Dec 2018 04:00 PM PST submitted by /u/shouldiclash [link] [comments]

Are vitamin/mineral supplements ever effective? Posted: 16 Dec 2018 07:46 PM PST I am trying to do my own research on this topic, as well as ask for others' input as well. I am overwhelmed by all the opposing information out there. I want to know if it's worth it for me to buy expensive vitamin supplements to complete my diet. I know I should eat most of my vitamins, I try my best to do so, but I naturally fall short on some vitamins due to dietary restrictions like dairy and meat. I am not eating terrible food then taking my multivitamin and calling myself healthy. I just want to know if it's beneficial for me to take an iron supplement to help prevent an iron deficiency or take any vitamin/mineral supplement to help prevent deficiencies. Do these things help? submitted by /u/vrmarti [link] [comments]

Why does the moon rotate at the same rate as it revolves around the earth? Is it a mathematically probable phenomenon? Posted: 16 Dec 2018 04:20 PM PST submitted by /u/XxFuhrpupxX [link] [comments]

What is resonance in chemical bonds? Posted: 16 Dec 2018 10:51 PM PST submitted by /u/slyCoyote2 [link] [comments]

Is there any membrane that allows gases to pass but blocks liquids? Posted: 16 Dec 2018 04:36 PM PST Looking for any kind of filter or membrane that allows gases to pass through but blocks liquids, similar to an osmosis filter. ​ Edit: I would like to know more about the principle of work, as Im guessing the creepage distance of such membrane will allow a controlled number of atoms or molecules pass through, easier for gasses and harder for liquids that come packed in chain-like structures. ​ To be more specific on the question, my ultimate goal is to filter out a stream containing gases that are saturated with high density liquids mostly suspended and only partially disolved. I am aware that this can be done physically with pipes specifically made to generate "jets" that push the liquids towards the pipe walls, but I don't think this works for the part of it that's dissolved within the gases. ​ Currently I am a last year industrial & electronics engineering undergrad, so I would be very grateful for an over the top explanation and a link to somewhere I can further research. ​ Thanks in advance. submitted by /u/Cauntu [link] [comments]

Why is bismuth not toxic like the other heavy metals? Posted: 16 Dec 2018 12:11 PM PST Lead, thallium, mercury and many of their associated compounds and organic derivatives are all highly toxic to humans and yet we can drink bismuth in pretty pink liquids to help upset stomachs. What is it about bismuth that makes it not as harmful as the other elements? submitted by /u/legends784 [link] [comments]

[Physics] How did we know that matter is made of atoms and how the periodic table was structured centuries before we had the technology to even remotely observe the basic structure of matter? Posted: 16 Dec 2018 06:58 PM PST submitted by /u/marquezzy [link] [comments]

How much temperature would I need if I wanted to create plasma out of a common metal(f.ex. iron, steel, copper)? Posted: 16 Dec 2018 12:48 PM PST By only adding thermal energy. I don't know how to calculate that, even approximately. submitted by /u/meroro2 [link] [comments]

[Medicine] Why can’t mesothelioma be cured? Posted: 16 Dec 2018 03:01 PM PST I realize my title might not make any sense. With the revelation that baby powder may have contained asbestos, why isn't there a cure for mesothelioma? What makes mesothelioma so bad that it's a death sentence? Is there any way to utilize stem cells or some other advance in medicine to combat the effects? Also, why isn't there a test for early detection? Is askscience the right place for this? submitted by /u/Throwawaymedical3000 [link] [comments]

Ageing while "time traveling"? Posted: 16 Dec 2018 03:48 PM PST I don't know much about these things but i'm wondering something. I'll try to explain what my question is as good as possible but this may be hard due to my lack of knowledge on the subject If I understand correctly there are places in the universe where if you could be instantly teleported there and spend a hour there and then be teleported back to earth, on earth let's say a year has passed (so you kind of time travelled). Now what would happen to your body when you're in such a place? Would you instantly become tired and hungry because in the first 10 seconds that has passed a day has passed on earth or would your body after the hour has passed just aged a hour? So how would your cells react is the question i think i'm trying to ask. Do they "know" time is somehow slower and adjust to this or not? I hope my question is clear and that someone can answer it, thanks in advance. submitted by /u/TheBohhit [link] [comments]

Are there precious resources (ie gold, copper, titanium) on the moon? Would it be possible to mine them? Posted: 16 Dec 2018 10:48 AM PST submitted by /u/Siraustinhoward [link] [comments]

How do we know modern chemicals and materials aren't toxic? Posted: 16 Dec 2018 09:53 AM PST I was watching some Cody'sLab videos on mercury which got me thinking; we used to use mercury in everything, and it was only until it was discovered to be harmful to the body that we limited it's uses. Is it possible that we could someday in the future find out that a modern material used in many applications is actually harmful? Or do we have ways of being confident that this is not going to be the case? submitted by /u/AMagnificentBiscuit [link] [comments]

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What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?

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• What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?
• There is a scene in the movie Skyfall where the villain removes his upper jaw, exposing his scarred and almost destroyed face, and claims it was due to a Hydrogen Cyanide capsule. Could Hydrogen Cyanide actually do that kind of damage? Would the villain have even survived in reality?
• How do annual vaccines remain in the bloodstream for a year instead of wearing off a few days later? Additionally, why are some shots (I.E. Tetanus) recommended every X years instead of annually?
• How can i control the wavelength of light when i pass it through an object using refraction?
• If infrared light is hot, then why doesn't visible light cook us? Visible light has more energy than infrared, right?
• Is there a byproduct of the production of alcohol that is destroyed in the process of distillation?
• Why don't animals like Seals suffer from decompression sickness?
• Why is music around the world based on octaves? Do they share common roots like the Indo-European languages? Is there music in other parts of the world that's not based on eight notes and their harmonics?
• Why can alpha and beta radiation not penetrate particularly thick materials?
• Is it true that vehicles (cars, semi-trucks, boats) have a tighter right-hand turning radius than a left-hand turning radius? Why is this?
• A glass breaks when it experiences a big enough temperature difference. But will repeated, smaller temperature differences over time eventually cause the glass to break?
• What's the natural form of Asbestos and how is it found in the mineral bed?

What’s stopping the water in lakes from seeping into the soil and ‘disappearing’? Posted: 15 Dec 2018 04:57 PM PST Thought about this question when I was watering some plants and the water got absorbed by the soil. What's keeping a body of water (e.g. in a lake) from being absorbed by the soil completely? submitted by /u/weh_town [link] [comments]

There is a scene in the movie Skyfall where the villain removes his upper jaw, exposing his scarred and almost destroyed face, and claims it was due to a Hydrogen Cyanide capsule. Could Hydrogen Cyanide actually do that kind of damage? Would the villain have even survived in reality? Posted: 15 Dec 2018 04:53 AM PST submitted by /u/BuddyNuggett [link] [comments]

How do annual vaccines remain in the bloodstream for a year instead of wearing off a few days later? Additionally, why are some shots (I.E. Tetanus) recommended every X years instead of annually? Posted: 15 Dec 2018 06:22 PM PST submitted by /u/Shouvik12 [link] [comments]

How can i control the wavelength of light when i pass it through an object using refraction? Posted: 15 Dec 2018 08:26 PM PST Hey redditors! I am currently working on a design on a product that involves the refraction of UV light through a certain object (prism or something, haven't decided yet) in order to refract the light. However, it is extremely important for the light to be a specific wavelength once it is refracted and any changes in the wavelength could ruin the whole product design. I was wondering what factors we would have to account for to make sure the wavelength of the light remain constant when passed through the object and what sort of object I would have to use in order to refract the light without changing its wavelength? submitted by /u/aadi_968 [link] [comments]

If infrared light is hot, then why doesn't visible light cook us? Visible light has more energy than infrared, right? Posted: 15 Dec 2018 09:14 PM PST submitted by /u/SkyEyeMCCIX [link] [comments]

Is there a byproduct of the production of alcohol that is destroyed in the process of distillation? Posted: 15 Dec 2018 04:56 AM PST If I drink a beer, a wine, or a cider, it will trigger a migraine. However, the trigger is not alcohol itself. I can drink whiskey, vodka, rum, or whatever until it gives me a headache from the hangover like any other human being. But if so much of a sip of a fermented alcohol passes my lips, I'm shortly hiding in my darkened room under all the covers. If I'm able to identify a trigger down to the chemical compound, it might enable me to better avoid migraine triggers so I'm very grateful for any input! 😊 I'm really hoping this doesn't violate the rules since the motivation to ask this is based in my personal healthcare. submitted by /u/Diblums [link] [comments]

Why don't animals like Seals suffer from decompression sickness? Posted: 15 Dec 2018 05:53 AM PST submitted by /u/AmazingCamel [link] [comments]

Why is music around the world based on octaves? Do they share common roots like the Indo-European languages? Is there music in other parts of the world that's not based on eight notes and their harmonics? Posted: 15 Dec 2018 01:05 AM PST submitted by /u/lAPPYc [link] [comments]

Why can alpha and beta radiation not penetrate particularly thick materials? Posted: 15 Dec 2018 10:44 AM PST submitted by /u/TobiasDahl [link] [comments]

Is it true that vehicles (cars, semi-trucks, boats) have a tighter right-hand turning radius than a left-hand turning radius? Why is this? Posted: 15 Dec 2018 05:12 AM PST I remember watching a video (like a couple years back) about remote controlled cars and how some cars will take longer to make the same left turn as they did with a right turn. The guy in the video drove the car in a circle with it doing the tightest possible circle it could on each side, and the left-hand turn made a much bigger circle than the one that came about from the right-hand turn. submitted by /u/HotdogLegend27 [link] [comments]

A glass breaks when it experiences a big enough temperature difference. But will repeated, smaller temperature differences over time eventually cause the glass to break? Posted: 15 Dec 2018 12:12 AM PST I apologise in advance if this has been asked, but for the life of me, I couldn't find a clear answer. I regularly pour hot water into the same glass and have never had any problems. Until yesterday, when the glass cracked. Now, I realise it could have been a particularly cold day, or hotter water than usual, which caused a greater-than-usual temperature difference, which is why it broke on that day, but none of the other hundreds of times I've poured hot water into it. But I did wonder, could the repeated stress over time, (caused by me filling the glass with hot water every day) have caused it to "fatigue" in some way? Or create tiny cracks or weak points? Such that, the last pour - rather than causing a greater-than-usual temperature difference - was really the "straw that broke the camels back"? And, acting on years of "fatigue" or "stress build-up" cracked an already vulnerable glass? OR, does glass not work that way? Thanks for any answers! I know it seems like a fairly obvious question, but I just couldn't find an exact answer. submitted by /u/jfartster [link] [comments]

What's the natural form of Asbestos and how is it found in the mineral bed? Posted: 15 Dec 2018 12:09 AM PST On the news about the J&J Asbestos issue they claimed that Asbestos and Talc are often found together in similar mined veins and this would cause the cross-contamination...This is the first I'd heard of asbestos being a (mineral?) at all and I'd like to know a bit more about how it occurs in nature. submitted by /u/Bcadren [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

What are the simplest animals that sleep? Amoebas? Hydras? Water Bears? Zooplankton? Or what?

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• What are the simplest animals that sleep? Amoebas? Hydras? Water Bears? Zooplankton? Or what?
• Do unvaccinated people pose a danger to vaccinated people? Why or why not?
• How different was plant life during the time of the dinosaurs vs now?
• Aren’t all animals part of the carbon cycle?
• Can specific freckles/moles and their locations on the body be hereditary?
• Why doesn't cholesterol build up in places other than the heart and brain?
• When we wake up for a minute in the middle of the night, do we end our sleep cycle and start a new one?
• How conductive is plasma, relative to something like copper or salt water?
• How accurate are modern IQ tests in measuring intelligence? What type of stuff do they measure, is it more right-brain or left-brain? And can someone with a high IQ be bad at certain basic things, e.g. spelling, remembering where he/she put his keys? What’s the best way to measure intelligence?
• Do cephalopods, e.g. squids, octopuses, have a dominant tentacle/arm similar to humans having dominant hands/feet?
• How do we get bacteria in our intestines?
• Are ants and bees susceptible to diabetes? Why or why not?
• Do organisms living in complete darkness (caves, deep water, underground) have a circadian rhythm? Most organisms do, but does it ever appear in those that have no access to a 24 hr cycle?
• When is an island an island, and when is it big enough to be "land"?
• My toddler likes to play with my glasses, and it got me thinking. How do doctors determine babies need glasses?
• Is atmospheric pressure due to molecular collisions or gravity?
• If graphene is a single layer of carbon atoms, how would it conduct electricity?
• What sound does a kangaroo make? Any at all?
• How is the frequency response of a microphone determined?
• What makes and erupting volcano like the 1883 eruption of Anak-Krakatau loud enough to be heard at great distances?
• Is there a way to create 3D models of small objects, a few cm across, that would be accurate down below a millimeter in resolution?
• How does Riemann integration work with hyperreals?

What are the simplest animals that sleep? Amoebas? Hydras? Water Bears? Zooplankton? Or what? Posted: 14 Dec 2018 10:18 PM PST submitted by /u/SovietBozo [link] [comments]

Do unvaccinated people pose a danger to vaccinated people? Why or why not? Posted: 14 Dec 2018 07:32 PM PST Disclaimer: I am vaccinated, and all for vaccinations, I underatand the importance of them fully. I overheard a coworker the other day say he didn't agree with forcing people to be vaccinated because the only pose a risk to themselves by not being vaccinated. I just want a way to rebutle his claim in a rationale way, or just to understand better myself. Thanks! submitted by /u/UncleGreggers [link] [comments]

How different was plant life during the time of the dinosaurs vs now? Posted: 14 Dec 2018 09:10 PM PST I would think there were more trees and CO2 consuming plant life than there is now, but are there any records or evidence that details how much more abundant it was? submitted by /u/Ramher_Jamher [link] [comments]

Aren’t all animals part of the carbon cycle? Posted: 15 Dec 2018 05:17 AM PST How does farming of cows and other animals affect global warming? I understand that they produce methane which is more harmful than CO2 but isn't all the carbon just recycled in the end? Say if the number of animals in the world was held constant wouldn't we reach an equilibrium of CO2 in the atmosphere? submitted by /u/tummmmmar [link] [comments]

Can specific freckles/moles and their locations on the body be hereditary? Posted: 14 Dec 2018 09:15 PM PST I know that having freckles vs not having freckles is genetic, but what about single specific freckles? My mother and I have a freckle on the exact same spot of our bodies. Not a tiny freckle, but a dark and distinct one that makes it seem like more than a fluke. Same goes with my father's side. My grandfather has a small mole on his face and my father has one that's the same size in the exact same spot. I also have this mole except maybe an inch down from where theirs are. submitted by /u/celestialvx [link] [comments]

Why doesn't cholesterol build up in places other than the heart and brain? Posted: 15 Dec 2018 07:19 AM PST I never hear about someone losing an arm, leg, liver or kidney due to buildup. It's always in the heart or brain...why is that? submitted by /u/Lyuseefur [link] [comments]

When we wake up for a minute in the middle of the night, do we end our sleep cycle and start a new one? Posted: 14 Dec 2018 04:18 PM PST So let's say you wake up in the 3rd stage even if only for a minute and you sleep in again, do you continue with the 3rd/4th stage or do you start all over again? submitted by /u/MyLaneBeLike [link] [comments]

How conductive is plasma, relative to something like copper or salt water? Posted: 15 Dec 2018 12:06 AM PST I remember listening to a sciencey song with the line '[in plasma] electrons are free' and I'm wondering if that means it is very conductive like other substances with delocalised electrons. submitted by /u/edweirdoE [link] [comments]

How accurate are modern IQ tests in measuring intelligence? What type of stuff do they measure, is it more right-brain or left-brain? And can someone with a high IQ be bad at certain basic things, e.g. spelling, remembering where he/she put his keys? What’s the best way to measure intelligence? Posted: 15 Dec 2018 02:41 AM PST submitted by /u/confusdYungAdolesent [link] [comments]

Do cephalopods, e.g. squids, octopuses, have a dominant tentacle/arm similar to humans having dominant hands/feet? Posted: 15 Dec 2018 06:49 AM PST And if yes, is the dominance wired to the left/right side of its body as it is in humans, or can one out of x tentacles be the dominant one, with no respect which half of the body it is on? submitted by /u/TrebuchetTurtle [link] [comments]

How do we get bacteria in our intestines? Posted: 15 Dec 2018 06:43 AM PST Main question how the bacteria survive the acidic environment of the stomach and get to the intestine? I know we have bacteria in our stomach too, most of them are aerobic and an environment in the intestine is anaerobic. Can they change the way they work at will? submitted by /u/attabey [link] [comments]

Are ants and bees susceptible to diabetes? Why or why not? Posted: 15 Dec 2018 06:26 AM PST submitted by /u/sutlerx [link] [comments]

Do organisms living in complete darkness (caves, deep water, underground) have a circadian rhythm? Most organisms do, but does it ever appear in those that have no access to a 24 hr cycle? Posted: 15 Dec 2018 05:55 AM PST submitted by /u/bohackistan [link] [comments]

When is an island an island, and when is it big enough to be "land"? Posted: 14 Dec 2018 02:34 PM PST Sorry but this stupid question is in my mind since this morning. submitted by /u/originalusername107 [link] [comments]

My toddler likes to play with my glasses, and it got me thinking. How do doctors determine babies need glasses? Posted: 14 Dec 2018 05:31 PM PST I'm assuming there is some sort of test, but babies can't tell you if 1 or 2 looks better. So how do they find visual impairment in infants? Is there a drastic difference in a visual test? What about babies who see things just a little blurry, do they slip through the cracks? submitted by /u/reanqu [link] [comments]

Is atmospheric pressure due to molecular collisions or gravity? Posted: 14 Dec 2018 05:29 PM PST On one hand, we are told that pressure in a gas comes from the molecules bouncing against everything and itself and exerting a force against the surfaces they collide with. On the other hand, we hear that the pressure of the atmosphere comes from the fact that there is so much atmosphere being weighed down above us. Where is the connection or bridge between these two? submitted by /u/enzotiger [link] [comments]

If graphene is a single layer of carbon atoms, how would it conduct electricity? Posted: 14 Dec 2018 09:37 PM PST Essentially asking the mechanics of how graphene conducts electricity. Is it possible to make a super durable/malleable wire/"tape" that can conduct electricity for a cheap price?Any research papers I can dive into too? submitted by /u/gidude_ [link] [comments]

What sound does a kangaroo make? Any at all? Posted: 14 Dec 2018 07:26 PM PST submitted by /u/MisprintPrince [link] [comments]

How is the frequency response of a microphone determined? Posted: 14 Dec 2018 05:17 PM PST How do engineers and manufacturers verify that the microphones they produce have a flat frequency response? Wouldn't such verification require a sound transducer that displaces a known volume of air to work over a similar frequency range, or multiple transducers of overlapping frequency bands? Do such standards exist? If so, how are they calibrated? submitted by /u/Killavolt [link] [comments]

What makes and erupting volcano like the 1883 eruption of Anak-Krakatau loud enough to be heard at great distances? Posted: 14 Dec 2018 08:57 PM PST submitted by /u/ChicodePico [link] [comments]

Is there a way to create 3D models of small objects, a few cm across, that would be accurate down below a millimeter in resolution? Posted: 14 Dec 2018 02:29 PM PST I know this is not a direct "science question", but a technical question for scientists/engineers. It is non-hypothetical, closed-ended, with a definite answer, and targeted at the science community at large, so I hope it will not run afoul of sub rules. Anyway, I am aware of LiDAR used to scan large areas (rooms, buildings, etc), but am not aware of a way to capture a high resolution virtual model of something like a chess piece or acorn that wouldn't cost a million dollars. Is this within our technical capabilities at this time, outside of massive machines like MRIs? submitted by /u/MomentarySpark [link] [comments]

How does Riemann integration work with hyperreals? Posted: 14 Dec 2018 09:20 PM PST All the discussions of integration with the hyperreals I've seen prove that the Riemann sum is finite, but not that its standard part is something other than 0. My confusion stems from the fact that the product of any finite number and an infinitesimal is itself an infinitesimal, as is the sum of two infinitesimals. So if we say the Riemann sum Σf(x)dx really is adding a series of numbers that have been multiplied by the infinitesimal dx, it sounds like we would get an infinitesimal result. What am I missing? submitted by /u/plugubius [link] [comments]

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