How Do Blacklights Make Things Glow?
Вставка
- Опубліковано 9 лип 2024
- Join Hank Green as he explains why blacklights make some things glow!
Hosted by: Hank Green
----------
Support SciShow by becoming a patron on Patreon: / scishow
----------
Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, Accalia Elementia, Kathy & Tim Philip, Kevin Bealer, Justin Lentz, Fatima Iqbal, Thomas J., Chris Peters, Tim Curwick, Lucy McGlasson, Andreas Heydeck, Will and Sonja Marple, Mark Terrio-Cameron, Charles George, Christopher Collins, and Patrick D. Ashmore.
----------
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: dftba.com/scishow
----------
Looking for SciShow elsewhere on the internet?
Facebook: / scishow
Twitter: / scishow
Tumblr: / scishow
Instagram: / thescishow
----------
Sources:www.physics.org/article-questi...
sciencenotes.org/list-of-thing...
science.howstuffworks.com/inno...
van.physics.illinois.edu/qa/l...
antoine.frostburg.edu/chem/sen...
Images:
commons.wikimedia.org/wiki/Fi...
commons.wikimedia.org/wiki/Fi...
commons.wikimedia.org/wiki/Fi...
www.flickr.com/photos/tellumo...
I used to have a collection of colored light bulbs. outside of the blacklight, my favorite was my coated red light bulb. I loved how it made the light creeping in from the outside look blue and made red objects look pale.
I think you should have gone a little more into detail about why things glow certain colors and the common methods for creating the UV radiation.
Scorpions etc.
That shirt would be crazy as hell under a black-light, Hank... You should have totally done part of the video under a black-light.
"Never use the honeymoon suite" - Gordon Ramsey
This is one of the best channels on UA-cam, I swear!!!
Loved this video btw!!*
Sir am afraid we are going to shutdown your account for two days
because you liked and replied to your own comment
vido sex
yes.
Why do I find this channel a lot more interesting than school
because school is trash and outdated.
unknown ? Lol k
+unknown ? so true
probably because your forced to Learn at school, while here you get to choose what to Learn and you want too
Because in school you have to sit there for half an hour (Or more, depending) to learn about the intricacies of the subject at hand, while on SciShow you spend maybe 3-10 minutes to learn just enough to make you look smart at parties.
A few more things:
1. A material is a phosphor because it just happens to emit visible light when struck by invisible light. All materials that we can see emit visible light in some way.
2. Cathode ray tubes (CRTs) emit electrons at high speed onto a phosphor-coated screen. The mechanism that excites the electrons in this case differs from that of UV radiation. Electrons are excited by absorbing momentum instead of photons.
3. Phosphor materials continue to emit light for a while, the time depending on the material.
4. Phosphorus, the chemical element, glows due to the production of light-emitting molecules in the presence of oxygen. Chemical luminescence like this is different from phosphorescence, and is used by some living things to glow in caves and deep underwater.
That shirt would be bitchin' under black light, Hank...
Agreed! I thought he would shine a blacklight on it before the vid ended!!
He didn’t want to expose the hank stains
In the 70s and early 80s I had black light posters, rug, bedspread, models, and stickers on the ceiling. Being a teen back then was fun.
Thanks for the info. You helped me write a whole paragraph on black lights for my project!
All these comments don't really...shine.
What a bright pun I have made.
shame you didn't get the glowing response you hoped for
My face just lightened up seeing these puns.
True, but I'd give your comment a glowing recommendation.
You all must be pundits in the joke world...
Why wasn't this video shot under blacklight? Fail...
He might have hair gel. Lol
Exactly!
XD
He forgot to play with a stick 😂
Mark Speir this WAS shot under a blacklight. what u see are the glow from objects that otherwise are invisible, including the presenter.
This is something that I should have already known. Thanks for posting.
A blacklight is basically a fluorescent light without the fluorescent coating and with some filter blocking out any non-UV light instead.
Or reversely you could say that a fluorescent light is a UV lamp made from an mercury/argon based gas-discharge lamp coated with a phosphor that fluoresces.
Excelente vídeo, muchas gracias por el excelente trabajo.
"oh baby .. ! Im... Im ..gonna Phosphor !.. "
Am i the only one who waited eagerly that he turns blacklights on and all of his Shirts dots glows like stars in the night?
dude i was seriously thinking about asking for
you guys to do an episode on thiss like 4 days ago,spooky,you guys are in my head,well whomevers QQ it was,was in muh head!
'...uses other than checking your bedsheets for fluids...' - That is actually a really good idea
This was such a satisfying video to watch, I've wondered for so long how it works and worked it down to two possible hypothesises of mine. Turns out both were oddly correct! *mind blown*
I had a bumble bee hanging out around my blacklight one time (they really like the UV) and I noticed that the yellow parts of its body flounced a bright (but not a"neon" looking) shade of yellow. Ot was really neat and seems to happen with every bumble bee that has gone near the black light so far.
Certain minerals glow under a blacklight.
+DeadLink My bed also lights up when I cumin it
Plants do this as well. Chlorophyll is fluorescent, but the emission is either quenched, too weak, or shifted out of the visible range in water.
Hold up a vial of chlorophyll extract to the sunlight, and you'll see it turn red!
Also, quinine (in tonic water) glows a beautiful cerulean blue
Orsbore my bathroom is full if minerals
When you wear such an awesome shirt, I'm gonna notice it 15 episodes in a row! :P
Thank you sir
Thanks for doing what my boss isn't competent enough to do and teaching me how to check for counterfeit bills.
Backlights matter
Wow very punny
wave or particle?
depends on how you look at it
Feeling the bern, huh?
Nah man, all lights matter.
What a happy surprise.
I can keep a scenic painting in my room that turns into a cool looking skull when partying!
Hmm for a SciShow video, I expected a little more nerdiness about the absorption and emission side of things.
Wow it took until the 8th semester of my chem degree until this topic came to light
LOL
Finally someone to talk about UV light & how it aid in a pandemic.
love it
A level chemistry soon and I'd like to see something on atmospheric chemistry such as the formation of radicals and what they actually are
fantastic
I love Hank's shirt
Why am I here you ask? well, I was feeling a HANK-ering to watch scishow
@scishow loads people claim in videos they can make black lights out of a phone torch. Although all of them have used fluorescent yellow sharpies, not the actual invisible ones. I’m trying to find out if invisible ink actually would illuminate with the right clip-on filter. Would this be possible?
i love this show and this guy make me love science
Blacklight feels & is pure magic.
So cool
Did anyone else think that they were going to demonstrate with that crazy shirt that Hank was wearing?
Why thank you!
Cool!
I would've said "magic", but I feel this is a much better explanation.
As a bouncer I've also used it to detect people to get drug tested, (at places where they had a zero tolerance politic)
Small rim of white at the nostrils was a dead giveaway...
If you were in an All-White room, and you were to use a Black Light, then it would pretty much only be effective for making it dark. But if you're in the dark, and you turn it on, then basically you're just going to be sinking away into the pitch black of darkness.
"Black light" is actually a contradiction of terms. Black is what we see in the absence of light.
an oxymoron*
+gamerchunk1 that's literally the same thing.
In the video it said that black lights mostly emit UV light which is invisible to us. So it could be taken as an absence of light.
Um, something that is dark, black absorbs most of the light. You cannot say black with the word light after it as it contradicts itself.
Black is what what our brains create in the absence of visible light
I want an episode on Whirlpools and other water votrecies!
Hank would you do a video on Bohmian mechanics? Or maybe Schrödinger's wave equation?
what camera did you used to film this video? and what lens?
He mentions fungus; In our animal shelter, its the first way of checking an animal and diagnosing it during intake for Ringworm. While generally not such a horrible infection for people (put cream on it, slap a bandaid on, good to go) it is EXTREMELY infectious to cats (and to a far lesser extent, dogs).
Blacklights help us stop one of the worst things possible in a cat shelter (this is assuming all cats are vaccinated against other diseases, such as panluke.)
Thank you, Black light gods.
3. Can fluorescence and phosphorescence be exhibited simultaneously from the same materials?please answer me
OMG THANKS
I love u hanks
Small correction. At 1:06 you mention that "phosphors are substances that fluoresce" when actually phosphors phosphoresce and substances with fluorine fluoresce. Phosphorescence and fluorescence are two similar but different processes. In particular phosphorescence is much slower hence objects still glowing after the black light is turned off.
good to know
I like that shirt
man.. So if I use a blacklight in my room it would be so professional as Jackson Pollock artwork?!?!
I, too, watched Guardians of the Galaxy.
To be fair, that joke has been around since Jackson Pollock. I groaned when I heard it for the 900th time in Guardians :(
We also use the same trick in radioactive signs, gun sights and key chains. Weak radiation from tritium gas will activate phosphors that release the energy via visible radiation, IE, light!
The wavelength shift due to absorption of photons then reemitting them at a lower wavelength is called the Stokes shift.
Or we could just call it a downshift of wavelength.
Please put a link in the comments for where I can buy your shirt!
Hank is basically just an adult, American me. That's pretty cool; I'm in some ways similar to hank!
i like to randomly pause the video and see what Hank's face looks like, some moment are funny
So the light absorbed by a phosphor has higher energy than the light emitted by it. What happens to that energy? Are these phosphors heating up or are they emitting other particles?
"...which means you can use black light to check for counterfitting."
_This_ is good to know.
You meant "home" in on a problem. Not "hone" in on a problem. I expect more from you, Hank. ;)
By the way. "Thanks to all our patrons on Patreon who keep these *answers* coming. If you would like to submit questions to be answered, .."
I noticed this quite a while back. Shouldn't it be "Thanks to all our patrons on Patreon who keep these *questions* coming"?
Nope. Patreon subscribers keep the videos with the answers coming.
Well, they do fund the show, and therefore, the answers that come out of it.
Ah well okay, I always understood it like "the patrons are giving us the answers and we just present it in a nice fashion". I know that's not how it works, but I couldn't get that thought out of my head.
+egalomon Your way makes sense too, don't worry.
I found best black black light is 1 or 2 on a simple shop light fixture 4 feet long or best known as F30T8BLB . Use when dark and shows how dusty or many things on surfaces you might not want to see .
Could you do one on cerebral aneurysms?
Electron spin reversal and the science of fluorescent pigments is an interesting topic if you want to delve deeper.
We also use UV lights to help treat Jaundice.
How does the sharpie challenge work?
.... so that's why that one Chris Prat Guardians of the Galaxy quote was so funny.
So what causes the "moving light" inside the buld you can see when you look at the bulb?
Hey Hey Hey! @SciShow I GOT A QUESTION! "If you stopped eating actual food and just took vitamin supplements for say a year or 2 what would happen to your body or would you be able to even last that long?"
Thanks for this video. I am not sure but I think lower frequency electromagnetic radiation has less energy so what happen to the energy loss? Is it transformed into heat as energy "loss" is often (always?) expressed? Does that mean that phosphor under UV light also emit infrared? But IR is even lower frequency than light which would mean another energy leak so now I'm confused which means I'm now so sure about my initial premise. Can someone enlighten me?
Scishow needs to do a video about Dmitry Belyev. Spread this around if you agree.(maybe it will help get their attention) If you have no idea who he is look him up. Its really interesting!
I am deeply disappointed you didn't whip out a blacklight, Hank! :P
I would very much like to know how long it takes for moles to appear...they keep popping up on my face and arms and hands and it's like one day they're not there and the next they are. Am I just being unobservant, or do they really poof onto my skin overnight?!
Any possibility to get pure uv without violet light?
I can’t imagine what my bed floor and walls look like under a black light it would hurt your eyes
I recently got a UV flashlight and was taking it around my house seeing what glowed and didn't glow, like you do, when I tried it on a potted plant the leaves showed up as a dark red. What's with that?
@scishow
This video got me thinking about my eyes. For some reason my eyes change color from green to blue and everything in between. I swear they have actually been grey a couple of times. Do you think its from different light sources hitting my iris? Or just my genes? I would really like to know.
You probably have teal-grey eyes, in between green and blue, and depending on the light it can strengthen either the green in teal, the blue in teal or weaken them to where its grey, if you went into red-orange light it would neutralize the green-blue, etc.
just lookin at all the spream jokes....so funny and og
would've wanted to see more physics about this.. absorption and "conversion" to larger wavelengths..?
can you make a video about Prosopagnosia (Faceblindness) ?
So I have a blacklight above my bed that I use everynight, not as a nightlight, just as a reading light type of thing. I'm wondering if this can hurt my eyes in the long run
can you get burned from blacklights? like a sunburn?
Why is my chewing super loud when I have earphone in???
Headphones block sound coming in. Chewing noises come from inside of you. Your ears can hear noises inside your body. With little to no sound coming in to go over your chewing noises, it's all you hear more or less.
yeah it's the same reason why you can hear yourself sing louder when you cover your ears
So UV-A is pretty harsh. It's the bandwidth that gets deep below the skins surface and causes cell damage. I assume this is largely mitigated by the low power of the bulb emitting it. All that said, I definitely feel like I've gotten a light sunburn when in a room filled with Blacklight for too long.
Guys pls i have a question i want to put black light and led light in my room in the same time i want the black light effect on the things that have in my room can that work
No mention of 1920's Depression glass? Seriously, shit guys! That is the coolest black light effect. Actual radiation emitting from glassware. I got a few at home under a black light. That green glow is lovely.
How did they make your shirt so loud?
Ultraviolent light
When I was a kid I had to spend the night over at a neighbor's house, and the girl there around my age said she had a blacklight bulb in her bedroom ceiling fan. I was excited, since I loved blacklights. I got to the bedroom, switched on the light, and no light came on. I said I thought her light was burned out, and she said no, Then walked over to a lamp, with a regular bulb and turned it on so we could see.
She painted the light bulb black, and still used it even though it was functionally useless. I told her that she probably should have painted it purple,and she told me I was an idiot, because then it wouldn't be a blacklight. * sigh *
Are phosphors the only group of compounds that glow?
and I wanted to see that shirt under UV light :D
FUN FACT: Real diamonds shine a beautiful light-blue almost cyan light under blacklight(or bluelight) which makes it easy to find out if you been lied to like my dad was when he bought my mom a moon-shaped ring with 'diamonds' only for me 10 years later to aim an uv flashlight at it to find out 1 out of 8 gems was a real diamond. Speaking of diamonds, screw them, they look like joyless glass go for labradorite, moonstone or opal(most beautiful gem trio in my opinion) instead if you're buying a ring for your darling.
+SciShow I have a question: Does all electromagnetic radiation travel with 'c' or is that only for the visible light spectrum? I think it's probably all radiation but I wasn't sure because it's called 'lightspeed', which makes it sound like it only applies to visible light. Pls explain.
"Lightspeed" is just a name, everything which has no mass travels at c. I think that we call it like that because it makes it easier to understand.
Does looking at blacklights cause vision damage like looking at a powered on lamp would?
Who here remembers blacklight posters, classic rock before if was classic and smoking copious quantities of Colombian, Acapulco Gold, Panama Red, honey oil, etc. etc.? Or am I the only one who'll admit it?
Why is there a formation of thick layer (kinda stuff) in a hot cup of tea?