Evanescent Electromagnetic Waves Seem Like Magic
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- เผยแพร่เมื่อ 21 ก.ค. 2021
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I show you how you can make "crystals" for microwaves to show total internal reflection.
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I accidentally put the second wax crystal with the microwave on the wrong side to compare it to the light experiment. But it still worked to deflect it from the detector due to the angle it hits the second wax crystal.
I hope you read this one
Sorry for my bad english.
if we compress normal air to high pressure and then we decompress the air to low pressure, will the air become cool? What if we compress and decompress water? .
This idea similar to how air conditioner expansion valve .
Does we need aircond gas for getting cool water after decompress the hot high pressure water?
sheesh
"the order of the factors doesn't alterate the product". 😜😁
Thanks for another interesting video! Greetings from Argentina. 👍
It’s alright
You bent the beam a second time to the direction you where standing. Unless you where trying to cook your self that would count as a D minus.
"Frustrated total internal reflection" sounds like the thing that keeps me from falling asleep at night.
A good way to describe those annoying thoughts indeed. Seems lejit.
This hurts it's so funny
@@theLuigiFan0007Productions *-l e j i t-*
I know the feeling 😩
because its screaming "wake me up inside"
I like how he makes it so interesting to actually learn something.
th-cam.com/video/CxgtEhe9eWA/w-d-xo.html... .
Yes
School teachers should take note of your comment
As a teacher, I have used his videos in my classes.
Came for science, stayed for the wholesome content and for this man's cheerful attitude
same
th-cam.com/video/CxgtEhe9eWA/w-d-xo.html... .
Wow
Came for the science, stayed to watch if he accidentally microwaved his hand 😂
"There's a bunch of experiments you can do at home, but you probably shouldn't
, it says" 😄
😂
Reverse psychology
@@ShomeAvi yea it kinda makes you want to do it even more haha
When the median in the gap is changed from air to water, the index of refraction is also changed, of course you don’t see total internal refraction. It’s not because the second prism catches the evanescence wave.
I believe you're correct that the optical part of the demonstration does not actually show frustrated TIR. Adding water increases the critical angle to about 60 degrees, which is the same as the prism angle, so TIR can not actually occur unless the laser at least normal or pointing more to the right. The water also doesn't change the fundamental problem that the gap is probably too large to allow tunneling.
Wow, Evanescence has a electromagnetic wave named after her, she's a great artist.
Amy Lee is proud
She's a great artist but she was named after the wave.
Sponsored by Vsauce, using the music from Legal Masses... and just this morning, Steve Mould and ElectroBoom did a project together. Is today TH-cam Crossover Day?
Let's make a project together 😂
Isn't legal masses used a lot by tkor?
whats next? mark rober, Veratasium, tom scott, physics girl & smarter every day?
lol it was so funny to hear him say "Hey VSauce, Action Lab here"
Edit: OMG THANKS FOR ALL OF THE LIKES AND REPLIES :D
Right? Wrong!
Or was it?!
Lol 😂😂
Or is it?
Omg, I came to the comments for that comment, n this comment is the first 1 I c 😂
"I'd like to thank VSauce for sponsoring this video"
:pikachu_surprised_face:
Through this man, Vsauce1 lives on...
:o
me too
@I care what
MusicSounds bot spotted
This video brings me to life
It really wakes me up.
It even saves me.
I had become nothing before this video.
This video calls my name and saves me from the dark.
TAL being sponsored by Vsauce is, perhaps, too much science for me to take.
It’s amazing
I can't believe you posted this, I am studying this very same topic as we speak!!
Nice! Snell’s Law
same i was studying this 1 week ago
Evanescent Wave is so amazing.
Her "Bring Me Back To Life" really touches your heart.
All my life I was absolutely certain that there IS magic in this world and we simply call it the electromagnetic field!
The inconceivable nature of Nature, like Feynman liked to call it:
th-cam.com/video/egB9p5ZbrEg/w-d-xo.html
Evanescent light waves...BRING ME TO LIFE!
WAKE ME UP! Wake me up inside.
I CAN'T WAKE UP! Wake me up inside.
SAVE ME! Call my name and save me from the dark...
Rather fitting, wouldn't you say?
That's what I was thinking.
"When you shine a piece of light" ah yes, I too measure my light in pieces
If you do this at a precise angle, it will sing 🎶"Wake me up, Wake me up inside, I can't wake up, Wake me up inside, SAVE ME!, Call my name and save me from the dark."🎶
This isn't the Evanescence music video i was expecting....
check out the otamatone one
If anyone is curious on what an EM wavelength is in meters, you divide 300 by the frequency in megahertz. So for a microwave oven the frequency is 2.45ghz the calculation would be 300÷2450=0.1224489796 or rounded up and simplified 12.25cm
dude, sponsored by curiosity box? good shit!
*stuff
@@rhaib **shit.No need for vocabulary fixing.
I remember when curiosity boxes were first being made.
@@rhaib Censoring people is not your job. It is also not polite.
What subject do you need as YT content?
The Action Lab : YES.
Oh wow, what an amazing experiment! Unusual setups like these are really memorable!
Keep up your amazing work!
ur videos really give goosebumps when thought of in a whole new level
Here for Amy Lee’s angelic voice
Learned more from this man than my 5 years of high school
S- Six
C- Cruel
H- Hours
O- Of
O- Our
L- Lives
Seven
Crappy
Hours
Of
Our
Lives
5?
Sixteen
Crumbled
Hits
Of
Our
Life
5 years lol
I like this "drier" format without the artificial surprise... Much better.
And great explanation.
The stuff I see on this channel brings me back to when I was a kid and science still felt like straight up magic.
I learn from you more than my science class
That was really cool!
Especially with the microwaves. The physics isn't that strange, but it's so counterintuitive that those boxes that didn't even had solid parafine wax in them, but just loose pieces, worked that well.
He made the experiment wrong, that's the reason it worked so well.
If he had made the experiment right I'm not sure that the effect was so intense
@@LeopoldoGhielmetti the wavelenght of microwaves is about 12cm which is not compareble with the spectrum of a few nm in a laser
Im pretty sure it would still work as good but even with the glass and with water in between it reflected a lot so we could say he optimized it insted of did it wrong :)
@@Lechxzs yes true, but the experiment was still made wrong, he has inverted the position of the prisms so it was not the same case as with laser.
With microwaves he used a double reflection, with laser he made the beam go straight removing the reflection with the second prism. Nothing to do with water or other "glue".
So in conclusion we have never seen how the experiment go with microwaves
One of the coolest experiments i have ever seen.
Long time watcher, first time commenter. Using the paraffin/ microwave combo to illustrate the same principles as light/acrylic prisms interaction was awesome. Love your videos. Keep up the awesome educating entertainment!
"Hey Vsauce, Action Lab here." 😁😆😆
Hey, I was wondering about the explanation of the effect occurring when you dropped water into the gap between two prisms to enable the electromagnetic wave to propagate through both prisms. As water has a different dielectric property than air, I would assume that the effect that enables wave traveling is more the different media in the gap than a gap that closes.
absolutely right
The crossover we all wanted.
I literally thought yesterday about TAL using the Curiosity Box.
Awesome, James. Very interesting take on EM wave-matter interactions!
*“Science is magic done right.”*
_-Me_
-Kurt Vonnegut
"Magic is science done right"
-_Me_
@@bornoflightningthunder8162 So true!
@@bornoflightningthunder8162
_"Magic is science done right"_
Doubtful, considering the concept of magic is several ten-thousand years older than that of science, and latter forms a narrow subset of the former.
Than what is magic done wrong.
not kind of "Evanescent" I was expecting XD
As always, great content! Thanks for the evanescent wave, get some rest, vacation, relax.
3:23 Yep, you nailed that one!
Hi, I have a question
I washed my eyes and I closed them while they were wet in a little dark place. When I moved the left to right and vice versa while eyes closed I saw some kind of circles
Why did that happen??
Probably the outline of the eye iris
I enjoy their music, didn't realise they work with light too
This guy is one of the coolest person in the world right now, doing awesome experiments at home.
There's something wrong here:
TIR happens when critical angle is reached, i.e. n1>n2, critical_angle > sin(n2/n1)
The index of the medium you go to has to be low enough for it to happen. What you are doing by adding water is essentially replacing the air, changing the n2 in the equation. You're supposed to have n1 about 1.5 (glass) to 1, but here you have 1.5 to about 1.3, which changes the critical_angle.
That said, it can work very well, and that's how we do Total Internal Reflection Fluorescence (TIRF) Microscopy
Ever since I've learnt about total internal refraction I've wondered why it exists, but my teacher wouldn't give me an answer. I'm so glad he's explained it here :]
*reflection
Vsauce sponsoring youtube channels. Interesting.
Crazy
It's videos like this that really Bring Me to Life.
Thanks for another cool experiment, you mad scientist!
An Evanescent Wave will repeat the following phrase “wake me up.”
5:05 Mmmm, I love the smell of cataracts in the morning!
I thought more of warm testicles 😌
OMG you are seriously the real life MacGyver! Great work! Love your videos.
Literally read this chapter in my physics book last night. Its cool to see you do the labs
Even someone who doesn't like science at all would watch your videos and say “Wow”
There's just too much that time cannot erase
This is fascinating stuff. Great video!
Yours are some of the most amazing videos on TH-cam
evanescence electromagnetic waves be like : *Wake me up inside...*
Lol
Evanescence is a music band and there's their song called: Bring me to life, and the most popular scene was when they say:
Wake me up inside!
WAKE ME UP!
Wake me up inside!
SAVE MEEEE!
BYU Electrical Engineering student here, thanks for the representation and inspiration!
Today's salvation is bought to you by the Corporation of the President of the Church of Jesus Christ of Latter-Day Saints
Oh my god. These videos are amazing. I love your videos, James. They are really amazing. I never thought there will be a channel on youtube that would actually explain a lot of science and also show the experiment too! Thank You a lot James! (I did subscribe)
Wow. You have outdone yourself. Truly a new idea for me.
wake me up
wake me up inside
About the micowave wavelengths, would it reflect with the crystal prism or only with wax?
The acrylic prism was likely too small (microwave wavelength is 12cm) and because acrilic is not entirely "safe" in a microwave it likely absorbs a bit as well. [ www.usplastic.com/knowledgebase/article.aspx?contentkey=952 ]
Acrylic isn't transparent to microwaves.
Recent subscriber. Awesome channel. Thank you for all the dedication and effort!
Very good demostration. never seen anything luke that with common household materials
I think he may have put the paraffin on the wrong side for the Evanescent canceling effect. Instead that was two complete internal reflections…
From what i gathered there wasn’t even any reflection after he joined the prisms. Im not even sure what this has to do with evanescent waves he just made it so that there was no change in density in the light path and it shines through the now “solid” block
@@theharwizard8093 That's the idea, he just implemented it wrong. It's all good, he made a correction in his comment, it should be pinned as the first comment on your feed.
@@kirkhamandy you know you have a good guy when he will humble admit his fault, and not hide it!
I bought some lasers and prism last week and I was observed that when we shoot green laser through the triangle side of the prism it appears to be red and then I did it with the glass slab also but it didn't happen again, I researched a bit and found out that it is due to fluorescence, I'm still confused about this term but then I placed the glass slab beneath the prism and shoot the laser through the glass slab and again it didn't happen. I thought of doing it by placing some water in between but I haven't done it yet due to my school exams but now I'm definitely gonna try it 2:55 !
How's your little science experiment? Did it work? I'm a bit curious now. 🤔
@@angelobello-an471 Well actually it was my language exam today so I couldn't do it yesterday, I'll definitely be replying if it works. Thanks for showing interest!
So did it work?
Me at the moment of read the notification: Action Lab playing again with the laws of the universe. 😅
Thanks for another interesting video of th physics of light and microwaves! 😀👍
Amazing demonstration
So that means I could use a paraffin Prizm and direct the wave to a point of my choosing based on prism design. What my question would be is "what is the distance is 4 usable microwave energy using a paraffin prism model?"
🤔
r/ihadastroke
Well, if you're talking about cooking food at a distance or a DIY directed-energy weapon - forget it. Like all electromagnetic waves, microwaves follow the inverse square law which means the intensity and thence the received power falls of with the square of the distance from the source. so if you double (ie x2) the distance the intensity goes down by a factor of 4 (=2 squared). and so on. And quite apart from he technicalities, you would be infringing exposure rules on non-ionising radiation which only allow you to let loose typically 100 milliwatts of power in the 2.4 GHz band, as used by Wi-Fi routers and similar short-range communications devices. Domestic MW Ovens work with powers of typically 600 watts to 1200 watts. They work and are permitted because they the waves are constrained by design as standing waves (waves bouncing back and forth in phase with each other) within the cavity.
@@Sparky-vj2dq there goes my new police radar scrambler lol. Thanks for the great answer
@@SickndSoul No probs but actually given your proposed usage, there's a a bigger problem. Frequency ain't right. Depending on where you are in the world and how old the police equipment is, Doppler speed radars operate between about 8 GHz and 36 GHz. Newer stuff is at the higher end. So the 2.45 GHz oven freq would have no discernible effect except perhaps very low level harmonic output.
Furthermore, even newer equipment is laser-based i.e. LIDAR and is essentially un-jammable with any power but adverse optical conditions can cause problems.
Everyone will get A+ if this guy become our teacher. No 🧢
Yeah
So well explained!
The direction of the causality here is interesting. I've never heard anyone say that total internal reflection happens because of an evanescent wave. I've always seen it the other way around; total internal reflection causes an evanescent wave to form. That's certainly how we derive it in classical electrodynamics. The situation is more complicated if you use quantum electrodynamics to explain it. I guess it's most accurate to say that a certain configuration of dielectric material causes both an evanescent wave and total internal reflection to happen simultaneously.
7:40 So wavelength could be the resolution of light
yeah it basically is. That's why scanning electron microscopes exist. Electrons are orders of magnitude smaller than visible light, allowing for around 250 times the magnification (or, if you want, resolution) of the best light microscopes.
Before the price of SEMs and AFMs came down, using shorter wavelength (blue or even UV) or viewing through oil (slows the light down to decrease the wavelength) were used. Moore's law pushed silicon chip manufacturers to switch to using UV in their photolithography to make components smaller.
1:01 such a cool moment.
(also I learned more than my 5 years of college bro)
Yeah
This experiment really wakes me up inside.
awesome demonstration of radiowaves!
WAIT WOULDN’T THE REFLECTIVE SIDE OF THE PRISM BE A PERFECT MIROR!?!
It is perfect mirror but only from a perfect angle.
3:15 Look at him trying to act like Vsauce, how cute 😆😁
Thank you, this is wonderful. I am trying to brush up on all the mathematical models for electromagnetics, total internal reflection, evanescent waves, optics,... And this video is convincing visual confirmation🙂
Arthur C Clark described this channel better than I can. "Any sufficiently advanced technology is indistinguishable from magic". I love the experiments and demonstrations you choose. You blow my mind so hard 🤣 with your lab full of action.
Knowledge.... (Weird Only Smol Person Is Commenting/Liking)
The two experiments are not equivalent, with glass you put the second prism to the other side the light was coming out, with microwaves you put the prism in the same side the wave was coming out
Yeah that was what I was thinking too. The second experiment the microwaves just reflects twice instead of going straight through like in the first experiment.
Evanescence sounds like a great name for a band
Whoa youtube sponsorception :) also, the wet prisms remind me of using a wet something to see through frosted glass, are they similar at all?
Super cool episode! Microwave ovens are super common, but you’re using one waaaay outside of the norm. It’s a cool juxtaposition of unknown and known. nice.
Wake me up !
Not first
I love these videos
Exceptional content as always.
0:10 "when you shine a piece of light"
First
First Reply
Nobody cares
Nice idea, but there is a problem with trying an Experiment with using water between the prisms: Internal reflections are dependent on the difference of refractive index, with a glass-air interface having a very different maximum angle than a glass-water interface has. Basically just with the addition of the water you no longer have total internal reflections in the glass but light passing out to the water.
Even in the details I learn new things with you. Great!
Amazing experiment with microwaves!
The first thing that popped to my mind when I read "Evanescent wave" was the band, and I was a former optics student lol
Simply outstanding!
Amazing work man
Impressive. Good presentation.
There's a neat trick using a glass table of the kind with transparent edges involving evanescent waves: if you shine a light (like the flashlight of a cellphone) from the edge right into the glass, when you press a finger under the table, you can see the spots where the glass is touching your skin light up from the other side of the glass.
Great - a lot of school labs in the UK have microwave kit to show students standing waves etc. If your lab has some of the older kit you will have seen huge wax plano-concave lenses and wax prisms. We have some in our lab. They are cast so have no gaps at all but don't leave them out in the sun!
Great demos well demoed. I often find something to be critical about but this was nice all around.
You just explained " how light travels in medium " so simply than others trying to explain same thing in whole video