Recent comments in /f/askscience
[deleted] t1_j4skb75 wrote
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UpperCardiologist523 t1_j4sgdet wrote
Reply to comment by echawkes in If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? by Ian98766
Does the level of energy the neutron hit with, decide what new atoms and therefore how many neutrons are left over? If not, what does? Or is it random?
Oh, and in your last paragraph. Does this mean that when they enrich uranium/plutonium, reactors are run on lower energy?
Sorry if I'm way off here. I'm a TV repair man, but curious about this.
--Ty-- t1_j4sfr88 wrote
Reply to comment by rededelk in What makes a fiber or fabric absorbent, wicking, breathable, or cooling? by DisenchantedAuD
Modern-day wools are way better than our grandparent's wools, too! They tend to be far less itchy if they're made well, because they go through a mechanical process that removes the scratchy bit. Merino wool products in particular have 0 itch to them!
Polyknikes t1_j4se6xz wrote
Reply to comment by bikedork5000 in If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? by Ian98766
This is an interesting concept that, despite being fairly well educated, I hadnt really internalized before. Thanks!
[deleted] t1_j4sdwm4 wrote
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rededelk t1_j4scmz4 wrote
Reply to comment by --Ty-- in What makes a fiber or fabric absorbent, wicking, breathable, or cooling? by DisenchantedAuD
Yes I can't explain it but wool is the best. I am fortunate that I don't get "itchy". Wool can keep you warm soaking wet and frozen unlike most synthetics (and wool doesn't get stinky). That said I have plenty of synthetics, it just depends. Hat to wool lined boots most of the time for my local and adventures
full_hammer OP t1_j4sclec wrote
Reply to comment by ellipsis31 in What happens to the energy of sound in space? by full_hammer
Ah that makes sense, thanks for the tuning fork example. That really helped it click
definitivelynottake2 t1_j4sbwro wrote
Reply to comment by SharkAttackOmNom in If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? by Ian98766
Thanks for the explanation :)
[deleted] t1_j4sb3ai wrote
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[deleted] t1_j4s9i8e wrote
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[deleted] t1_j4s9cx5 wrote
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ellipsis31 t1_j4s9a0a wrote
If you yell in space the energy goes into the gases that you are expelling as heat. If you tap a tuning fork in space the energy pretty much stays in the tuning fork as heat until it can be radiated away as infrared.
Ok-disaster2022 t1_j4s64pi wrote
Reply to comment by iksbob in If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? by Ian98766
If you looked at it on an energy diagram the reaction peak gets broadened, but the area under the peak doesn't significantly change iirc. This is doppler broadening. In certain circumstands doppler broading can allow certain reactions to occur that wouldn't.
[deleted] t1_j4s4p12 wrote
echawkes t1_j4s3z3l wrote
Reply to comment by UpperCardiologist523 in If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? by Ian98766
U-235 has 143 neutrons. When you strike it with one more neutron, the total is 144.
Fission usually splits one atom into two atoms, with some left over neutrons. There are a number of different pairs of atoms that are possible outcomes. Sometimes, the pairs of atoms produced add up to 141 neutrons, with three free neutrons left over, and sometimes they add up to 142 neutrons, with only two free neutrons left over.
For low-energy neutrons striking U-235, the chance of fission is about 6 times as high as absorbing the neutron and becoming U-236.
JCMiller23 t1_j4s2fxf wrote
Reply to Do teeth already have ridges before erupting? How do teeth fit in so nicely after erupting? by Lancerinmud
When adult teeth emerge from your mouth, they do it slowly and considering that you are chewing everyday they get slowly put into place by the teeth you already have. If they were to stand out they would consistently get more pressure on them (by the opposite teeth that hit them when you bite) and that would shape their alignment.
[deleted] t1_j4s1ncc wrote
Wiz_Kalita t1_j4s134f wrote
Reply to comment by TerjiD in If nuclear fission in U-235 causes the atom to be split into 2 smaller atoms (such as Kr-92 and Ba-141) then how is it that U-236 is produced as waste since the U-235 was just split into smaller peices? by Ian98766
It's decay because the atom is going from a higher energy state to a lower energy state. It's very much like rolling down a hill except instead of picking up speed it converts potential energy into radiation.
Coomb t1_j4s0nub wrote
Reply to comment by rededelk in Does anybody have any good examples or uses of negative derivatives of displacement, such as absement, absity, and so on? Though it is easy to calculate, it’s hard to find use for it. by LunarSolar1234
Every algorithm is a set of "if this, then that" steps. That's the definition of an algorithm. Why are you asking this question? Do you have a more specific question?
wastedintime t1_j4slhdq wrote
Reply to comment by ellipsis31 in What happens to the energy of sound in space? by full_hammer
So, since the tuning fork doesn't have the resistance from the air, which it moves to make sound, will it vibrate for a very long time?