How do we still have radioactive particles on earth despite the short length of their half lives and the relatively long time they have been on earth? |
- How do we still have radioactive particles on earth despite the short length of their half lives and the relatively long time they have been on earth?
- How long would we see a Super Nova in the visible spectrum ?
- Why, how and what does it mean that light waves and other waves are sinusoidal?
- What is between neutrons/protons and electrons?
- Why are rain clouds grey and normal clouds white if they're both made up of water?
- How do we really know what's beneath the Earth's surface?
- How are the sine and cosine functions derived?
- Do you need more force to launch a rocket from the ground or to land it on said ground?
- How is ethanol produced industrially?
- How do submarines communicate with surface ships and satellite? Does (salt) water affect RF transmission?
- Why is lithium-ion technology preferred for grid energy storage?
- Why do marshmallows blow up when you microwave them?
- If the density of polystyrene is 1.04 g/cm^3, why doesn't Styrofoam sink in water?
- Are there particle annihilations that result in other Bosons besides photons?
- I have read that ball bearings should be packed in grease, to reduce friction between the balls & the races. In some cases, couldn't the grease INCREASE the friction, by touching parts of the ball that would otherwise be in contact with air?
- Why aren't areas that are below sea level covered in water?
- How does the CPU know what an operation an opcode bits represent?
- Do insect colonies experience plagues?
- So what would happen if you took off your helmet on mars? It has a form of an atmosphere so I wouldn't imagine it'd be the same effect as space. How long would you have to live and what's the most likely cause of death?
| Posted: 11 Jun 2017 03:20 AM PDT For example carbon 14 has a half life of 5,730 years, that means that since the earth was created, there have been about 69,800 half lives. Surely that is enough to ensure pretty much negligable amounts of carbon on earth. According to wikipedia, 1-1.5 per 1012 cabon atoms are carbon 13 or 14. So if this is the case for something with a half life as long as carbon 14, then how the hell are their still radioactive elements/isotopes on earth with lower half lives? How do we still pick up trace, but still appreciable, amounts of radioactive elements/isotopes on earth? Is it correct to assume that no new radioactive particles are being produced on/in earth? and that they have all been produced in space/stars? Or are these trace amount replenished naturally on earth somehow? I recognize that the math checks out, and that we should still be picking up at least some traces of them. But if you were to look at it from the perspective of a individual Cesium or Phosphorus-32 atoms it seems so unlikely that they just happen to survive so many potential opportunities to just decay and get entirely wiped out on earth. I get that radioactive decay is asymptotic, and that theoretically there should always be SOME of these molecules left, but in the real world this seems improbable. Are there other factors I'm missing? [link] [comments]  |
| How long would we see a Super Nova in the visible spectrum ? Posted: 10 Jun 2017 06:59 PM PDT Would we see something before hand and after in other spectrums and why? I understand the distance would be a huge factor. [link] [comments]  |
| Why, how and what does it mean that light waves and other waves are sinusoidal? Posted: 10 Jun 2017 11:56 PM PDT |
| What is between neutrons/protons and electrons? Posted: 10 Jun 2017 06:29 PM PDT |
| Why are rain clouds grey and normal clouds white if they're both made up of water? Posted: 10 Jun 2017 05:08 AM PDT |
| How do we really know what's beneath the Earth's surface? Posted: 10 Jun 2017 02:34 PM PDT The deepest hole we've ever dug is the SG-3 branch of the Kola Superdeep Borehole, which penetrates 7.5 miles into the Earth's crust. As deep as this hole is, it only goes 0.002% of the way to the center of the Earth. How then can we know what is beyond the Earth's crust? How do we know what the Mantle consists of? How do we know what the outer and inner cores consist of? And how do we know the thickness/density of each? [link] [comments]  |
| How are the sine and cosine functions derived? Posted: 10 Jun 2017 05:28 PM PDT I understand that for certain angles, using the relationships between the sides of 30-60-90 and 45-45-90 triangles can be used to find the value of sine and cosine. But what I don't understand is how those functions are found for different angles, like 11 degrees. In practice you use a calculator, but the calculator's answer has to come from somewhere. [link] [comments]  |
| Do you need more force to launch a rocket from the ground or to land it on said ground? Posted: 10 Jun 2017 06:21 PM PDT |
| How is ethanol produced industrially? Posted: 10 Jun 2017 03:53 PM PDT How do companys produce ethanol without yeast? I would think that for industrial amounts relying on yeast would be very unreliable and time consuming, so there must be a way to produce relatively pure ethanol for labs and such purely through non-biological sources. But if this is the case, how come you don't see it being sold as a very strong drink, like everclear? [link] [comments]  |
| Posted: 10 Jun 2017 09:28 AM PDT |
| Why is lithium-ion technology preferred for grid energy storage? Posted: 10 Jun 2017 04:43 PM PDT It seems that many new electricity storage plans are based on lithium-ion-type chemistry. As far as I know, Li-Ion batteries are preferred for many applications because they have a high energy density, a low self-discharge rate and no memory effects. These benefits seem useless if you're just placing the battery somewhere and charging & de-charging it every day. On the other hand Li-Ion batteries age faster and are supposed to be more expensive than other types. A back of the envelope calculation (6$/kg lithium carbonate, $2/kg Mn ~ 5$/kg LiMnO3 ~ 20$/kWh spent on raw materials (assuming 250 Wh/kg) battery) tells me that quite a bit of the 125$/kWh of the Chevy Bolt is spent on raw materials. Specifically NaS chemistry seems like it has the potential to be much cheaper. Are there no benefits to large-scale professionally maintained lead-acid systems? Can't we build something based on a couple of cheaper elements? Especially when batteries with 1/10th the energy density would work just fine? [link] [comments]  |
| Why do marshmallows blow up when you microwave them? Posted: 10 Jun 2017 04:22 PM PDT |
| If the density of polystyrene is 1.04 g/cm^3, why doesn't Styrofoam sink in water? Posted: 10 Jun 2017 09:12 AM PDT |
| Are there particle annihilations that result in other Bosons besides photons? Posted: 10 Jun 2017 01:34 PM PDT When reading about particle collisions and annihilations, the most common example given is a collision with an electron and a positron, resulting in two high-energy photons. Are there other collisions which result in annihilations with different force-carrying particles? If so, does this imply that there is more to duality besides particle charge? [link] [comments]  |
| Posted: 10 Jun 2017 04:45 PM PDT |
| Why aren't areas that are below sea level covered in water? Posted: 10 Jun 2017 06:26 PM PDT Wouldn't water flow downhill into these areas and create bodies of water? [link] [comments]  |
| How does the CPU know what an operation an opcode bits represent? Posted: 10 Jun 2017 02:00 PM PDT We've always been told a computer knows how to perform an operation on code based on what it's expected to find. But how does it come to expect something such as ADD (memory location operand) to the ACC. How do a bunch of logic gates and 1s and 0s know that the operand means ADD? excuse the title grammar error [link] [comments]  |
| Do insect colonies experience plagues? Posted: 10 Jun 2017 10:35 AM PDT Ants, bees, termites, seem to live in the kind of conditions that would make humans very susceptible to plagues. (By a plague, I mean a very high-mortality contagious disease). Do entire colonies of such insects occasionally die to contagious disease? [link] [comments]  |
| Posted: 10 Jun 2017 02:12 PM PDT |
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