I think Super-K is the place with water so pure that it will leach pretty much anything which was discovered when one of the tech's hair got wet while leaning over the water. The hair looked bleached after it went into the water. My googlfu is not finding anything to confirm though
Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
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Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#52This is fantastic news! Long COVID is awful, so I'm glad to see that she's recovering, if only incrementally.
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#53Welcome back. One of my staple YouTube Subscriptions. I’m today years old learning that the light that we actually see on earth today came out 100s of thousands of years ago.
It's not the same photon though. The fusion happens in the core, then takes millennia for the energy to escape. During that time photons are emitted and absorbed by the atoms, until the surface emits one that finally travels to the earth in 8 minutes. Anyway that's taking you from the ELI5 to the ELI9 version. I'm sure someone on here can correct it further.
Photons are generated in the star’s core but the core is dense. The photons move around the core, bouncing off other particles, a random walk. It takes a vast amount of time for that photon to escape the sun and reach the Earth, as per monte-carlo simulations of this random walk.
However, as the photon collides with other particles during its random walk, some of its energy is transmitted to those other particles. Sometimes a collision transfers energy to it too.
In a simple model, the energy that originally belonged to the photon gets transmitted from particle to particle through convection, and can escape the star through radiation long before the original photon reaches the surface. I don’t think that model is supposed to be physically accurate, rather to be an illustration about the convention process inside a star.
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#54I think Super-K is the place with water so pure that it will leach pretty much anything which was discovered when one of the tech's hair got wet while leaning over the water. The hair looked bleached after it went into the water. My googlfu is not finding anything to confirm though
Ha, I had never heard of this effect despite having studied Kamiokande (well neutrinos, at least) as part of a mini-dissertation for my B.Sc.
However, looking for sources relating to leaching by ultra pure water (UPW) not much turned up.
I did however find on Google Scholar a paper "Ultrapure Water: friend or foe?"... which lead me to https://www.balazs.com/sites/balazs/files/2023-03/pub0039-up... . Reading between the lines, Marjorie Balazs appears to have made a career out of UPW; she says in that paper:
"The ability for UPW to absorb and dissolve or react with all kinds of materials complicates other aspects concerning its use in the processing of wafers."
Seems like UPW dissolves anything, so lends credence to the anecdote.
Interesting topic, hadn't thought about UPW for wafer fabrication before.
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#55Dianna got better sometime last year as well, just in time to fly home to Hawaii for her father's funeral (yeah ...), but she got a lot worse again later. I really hope things will keep going well for Dianna now. Props for her husband who's been incredible of taking care of her.
This is the nature of ME/CFS (caused by Covid or otherwise), it does vary somewhat over time although the course is not always to improvement or around the same level but sometimes to death. She received some form of experimental treatments in order to gain the prior recovery which was at least a stellate ganglion block, she has not mentioned what else she may have received.
Hopefully she maintains a higher baseline from here on out and the production of these videos doesn't produce further Post Exertional Mailise that could worsen her condition.
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#56Earlier quoted context omitted.
It's not the same photon though. The fusion happens in the core, then takes millennia for the energy to escape. During that time photons are emitted and absorbed by the atoms, until the surface emits one that finally travels to the earth in 8 minutes. Anyway that's taking you from the ELI5 to the ELI9 version. I'm sure someone on here can correct it further.
I haven’t tried to look up the history of this claim, but here are some guesses: 1. There’s a sort of diffusion process going on. Photons from the core have some mean free path as a function of radial position (and, obnoxiously, of wavelength as well, so maybe we ignore that). You could calculate the mean time for a hypothetical object emitted from the core and traveling according to those mean free paths to escape.…
belated edit: My comment about “whatever, the temperature is high” is silly. The mean photon energy is about 2.7kT, which scales in direct proportion the interest bits of the Maxwell-Boltzmann and Bose-Einstein distributions (see [0] and [1]). At 2.7kT, the curves are pretty close, but you don’t have to go down that far to get a big difference. So tagging all the light would cause a substantial change in the sun’s color.
[0] https://scholarship.haverford.edu/cgi/viewcontent.cgi?articl... Eq. 16 [1] Handy plot at https://commons.wikimedia.org/wiki/File:Quantum_and_classica...
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#57Dianna got better sometime last year as well, just in time to fly home to Hawaii for her father's funeral (yeah ...), but she got a lot worse again later. I really hope things will keep going well for Dianna now. Props for her husband who's been incredible of taking care of her.
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Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#58Wonderful to hear. Her long Covid was heartbreaking (saw the videos). I hope she gets stronger and stronger! Welcome back!
Some of my favorite YouTubers have done guest spots on her channel, which made me love them a little bit more.
Her back catalog is good and you still get paid for people watching your old videos.
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#59How much of the mass of the universe is neutrinos?
Re: Physics Girl: Super-Kamiokande – Imaging the sun by detecting neutrinos [video]
#60I think Super-K is the place with water so pure that it will leach pretty much anything which was discovered when one of the tech's hair got wet while leaning over the water. The hair looked bleached after it went into the water. My googlfu is not finding anything to confirm though
Isn’t that also the one where a sensor imploded and caused a chain reaction that destroyed like a third of the other sensors?