Lasers measured with CD measured with lasers!?!

[@TonyTear]

These videos are definitly awesome. I once didnt remember your name so i just searched magnet dude.

[@Kiran-oy7cb]

bruh

[@theschwag]

That gift was awesome looking! Good job, Spencer! 👍

[@vinodkumar-wm3oq]

Sir thanks for responding to our comments and making this video! I think it's about time that you made a tutorial video on how lasers work and how they have improved over time and modernized the study of physics(of course you can use some your own lasers to demonstrate also :)

[@zachaliles]

There aren't many channels that I make a point of watching every video. Yours is one I get excited when I see a new video get published. I love your enthusiasm. And thank you for the in depth, high quality content.

[@Batmanstan07]

Love lazers and magnet if you were a teacher, students will be wide awake for your class

[@shuttleman27c]

Either that, blind, missing some limbs, or any combo of the above

[@wecksell]

The last equation, @ 10:45 , where you say you need to use a memory function, you actually don't. The value that you put in memory, you can instead do 1/x, and then multiply with your d_nm. So I think both are quite beautiful. Thank you for a very good channel and videos!

[@SantanaleeC]

I love your videos so much it makes me sad they're so far apart but I understand your work and probably a lot of editing. Keep it up though please.

[@bongobongo7416]

I love his videos as well. There just so, cool and satisfying.

[@video99couk]

6:28 Agghhh! My hexakosioihexekontahexaphobia! No, I've never heard of that either, so I've learned more than I expected to from this video.

[@marinescuvladdaniel745]

Is good to see you back :)

[@hamzaraissouli]

An upload from this channel is all I needed this weekend. Amazing as usual!

[@fyighfreak]

Loved the bit at the end. You're very thorough and to-the-point with your explanations, it's always refreshing when youtubers refrain from "skipping the math part" :D

[@honkems]

This is my new favorite science channel; soothing voice, cool, practical experiments, interesting results, you've got it all. Keep it up!

[@novatheumbreon1364]

That logo gift looks superb. I wish I had one like it.

[@holly9096]

You’re probably the purest KZbinr I’ve ever subscribed to. I love your channel. More quality videos = more happiness to me.

[@hisride]

You are an asset in the field of scientific communication to the public eye. You share your knowledge with excitement and joy, whilst remaining humble and modest about your achievements/innovative ideas. For this, I thank you

[@mesuchang]

This has to be the comfiest channel on this website. Thanks for your work.

[@brainiac75]

Glad you like it! New video coming very soon :D

[@Seegalgalguntijak]

I like the more frequent uploads! Even though I'm a couple days back in my "Subscriptions schedule", I appreciate the high quality content you produce!

[@Dennis-gr2fx]

Brainiac 75. That's a good title for your videos. Jeez you sure are bright. Deep but very interesting- thank you.

[@GhostOdyssey]

So therapeutic and so informative. I especially love how you reward the viewers who watch it all the way to the end of your video. Fascinating, as well as mind-cleansingly soothing! Love your videos and your voice, especially! : D

[@tehlaser]

10:47 You can avoid using the memory functions on the calculator in that situation by hitting the reciprocal button (1/x) after calculating the denominator, then multiplying by the numerator, btw.

[@zaprodk]

Nice calculations. Congrats on that awesome sign!

[@Forssa1]

666.666, repeating of course.

[@General_LEDobi9187]

well thats a lot better than we usually do

[@Hi-ix5bb]

666 the devil's number

[@Haydy5040]

@@Hi-ix5bb The original text says 616 and it probably is some code refereeing to Nero. It makes sense in context too lol.

[@shahgreyson8557]

I'm glad to know your next video, brainiac. Keep it up

[@AttilaSVK]

It might has been said, but you don't need to use the memory function in the second formula. Once you're finished with the calculations in the denominator, just hit 1/x and then multiply the result with the numerator.

[@literallyaghosttpoc]

Before i had to leave college, Math was my biggest passion. Finding your videos on chemistry (As with the magnets and elements) and this laser one.. It's like discovering and old toy or watching a movie you forgot you loved. +1 from me.

[@brainiac75]

Sounds like we have the same interests so you have come to the right place - much more to come. Welcome aboard :)

[@keiyakins]

Your guess about the track spacing is exactly correct. As manufacturing got more precise, cramming in a little more data was easy. In fact, there was a proposal to do it even closer together... But DVD was out by then.

[@Sonicgott]

These complex mathematical algorithms are a bit daunting at first, but, when you know what to do, they're quite helpful. My philosophy is that the difference between an easy question and a difficult one is whether or not you know the answer. :) Kudos to your channel. May it live another 10 years!

[@gummel82]

That was very interesting! Please never stop making videos

[@steelers4558]

Hope You Love The Sign. I love watching your videos. They teach me new things and I just enjoy them!

[@sidneyfmn]

Cheers from Brazil! Love your videos, they are very entertaining and relaxing to watch. It is pure relaxing science!

[@luky7080]

Even if I don't like maths and formulas, I will always reach the end of your videos ;)

[@102819921]

Wow that plexiglass logo is sick

[@cannibal0067]

A new video, finally! :) I love science, but I love your voice more.

[@geekychannel2543]

This channel is so relaxing

[@awiseseal7559]

I know it's a good day when I see you've uploaded a video. :)

[@kino4653]

Great video and presentation. I employed the same technic, but with a different formula to mesure the wavelength of my red cheap laser, and I found it was around 750 nm, I think it's correct because my laser is red, but not very precise as I don't have a diffraction grating and a good laser to check the CD, but it was a 700Mb one. My formula is this for 2 fents : i(distance between 2 spot of light) = λ(wavelength)*d(distance CD-wall)/a(distance between 2 fents : 1,5µm) λ = i(6 cm in my case)*a(1,5*10^(-6))/d(12cm in my case) λ = 0.06*1.5/(0.12*10^6) λ = 750*10^(-9) = 750nm which is red. But at 3:42, you wrote θ1= arctan(S1/2L), isn't it rather θ1 = artcan(S1/L). I know that with what you wrote, your results are right, but I have never used arctan like that. Even by defining the hypotenuse with the theorem of Pythagore, then using arcsin or arccos, I don't have the same formula as you.

[@jakez082]

It's interesting seeing the things I'm studying in college applied in the real world. Good video!

[@o3ville1]

Fascinating video dude. The maths is way above my pay grade though. Keep it up :)

[@JoseEncarnacao]

Awesome video, and better yet cheers for the feedback of those formulas, and the LED stand. Those fans are awesome

[@MoparStephen]

Excellent video, very informative and well presented. I love the great user comment which greatly simplified your calculations. Almost made me miss my math studies (been out of uni for 20 years now).

[@aajjeee]

I actually really like your scientific approach on this one

[@rileyguy5892]

Oh man, hearing Kevin Macleod's 'Dream Culture' play in your video was great, lol.

[@weijholtz]

actually it is possible to measure the laser wavelength using the ruler seen at 2 min, the mm lines can be used as a grating (with grating constant 1mm), use a small incidence angle. thank you for your videos!

[@rabrobinson4085]

Yay!! The magnet videos are back!!

[@tuatara77]

Hi braniac you are the person who got me addicted to Neodymium magnets and lazers and I wish one day you will begin to upload more often, but great content. Also I was wondering when you would join your two 6 by 2 inch magnets (if you weren't joking about it in the video where you unboxed the second one because I'm really looking forward to seeing that happen

[@magventure1019]

tuatara _77 same

[@tuatara77]

Mag Venture I can tell you like Neodymium magnets because of your logo for your channel

[@magventure1019]

;]

[@brainiac75]

I'm trying to reach a monthly upload this year (now on a part time dayjob as mentioned in an earlier video). I am going to attempt to pair up the two 6x2"s in the future. Not sure when though... Thanks for watching!

[@magventure1019]

Brainiac75 You Will Most Likely Damage Them Both, And Maybe Your Whole Arm, Your Choice But It Seems So Dangerous...

[@rationalscientist]

Woah man! You got something against that CD-guy? Right throug the crown-jewels.... ;)

[@kredodyn5378]

I hate maths but I love your videos !

[@blower1]

I love this channel....it's melodic to an engineer such as myself.

[@GQuack]

Great video as always! I do not have the phobia mentioned in this video, and I cannot wait for the new magnet video! Let's hope you do not hurt.

[@brainiac75]

Thanks! No worries, I will not have the 5 large magnets in the room at the same time and no heavy weight lifting :)

[@pileggitech]

Great video. It was nicely edited too. Thumbs up and subbed!

[@brainiac75]

Thank you very much - and a late welcome aboard :) (somehow your comment ended in the spam folder - no idea why...)

[@pileggitech]

No worries! That happens to me all the time too.

[@LtKernelPanic]

If you like lasers you should try to get your hands on a 589nm yellow. While far from cheap the golden yellow beam it produces is second only to my multiline argon as my favorite laser in my collection. The amber color from my 594.1nm HeNe is pretty sweet too.

[@GRBtutorials]

Just googled some photos. Beautiful!

[@stevec00ps]

Woo my comment is in the first few frames! Thanks and thanks for the video :)

[@alicewyan]

You don't need memory functions for those formulas! The standard calculator has a "1/x" button that gives you the inverse, which you can multiply straight away by the numerator to get the result.

[@nomekop777]

Would you be able to scale the distance up by 1 billion instead of multiplying the answer at the end? For example, at 5:35, you could just keep that distance scaled up to save a step, since it doesn't look like you're doing any more functions after that

[@Meister205]

Thank you for making this video, I learned something today again!

[@keshavvats7225]

sir,can i get to know more about equations and measurement basis have you used ?

[@martineden1165]

Looking forward to the monster magnets in action! Thank you for teaching what you know it is greatly appreciated!

[@vinicius9670]

I liked the way you wrote: 666 2/3. It's a prettier way than decimals one lol

[@brainiac75]

Hehe, and more precise. Thanks for watching and commenting again ;)

[@amir-lp2mx]

Actually there is a formula to calculate the wave length in young's experiment (which is what you performed) X=nλD/a n: number of bright spots X: distance between spots D: distance between the wall and the disk a: distance between disk's lines

[@shitheadxb]

Hey again! Super awesome video

[@GRBtutorials]

I recommend using a scientific calculator made for that purpose, like the CASIO FX-991 I use. Or Spotlight on a Mac. It's fantastic, just press ⌘Space and enter your calculation in a single line.

[@a.l7025]

i am so glad i found your channel!!

[@phafifi]

Hello, It is very informative. I am wondering could we find a way to measure a film thickness using a laser? Thanks

[@abteentajdin8877]

I am officially worried about the next video and the fact that it is possible to use a CD to calculate a wavelength of a laser was quite fascinating and also seeing the fact that you had to extend your ruler was quite funny , thank you so much for your hard work for making this video's I appreciate it greatly and I can't wait for the next video , keep up the amazing work that you are doing PS : sorry for any mistakes and greetings and salutations from Iran PPS : you can literally pick up girls with the Monster Magnet that you have

[@brainiac75]

Thanks Abteen! I will not have the 5 largest magnet in the room at the same time ;) Instead of extending the ruler I could have moved the diffraction grating closer to the wall, but for consistency I chose to just extend the ruler x) Also turned out to be a nice way of illustrating indirectly how long the wavelength of the ancient laser pointer is. Greetings back from Denmark as always!

[@dhairyajoshi_]

I love this channel. All I wish to do but can not can be viewed here. Thank you.

[@jcsomers111]

I liked the laser videos, though I am really excited to see more magnet videos, they are some of my favourite. I love your channel, makes me want to come and do science with you.

[@guyhuguenin6992]

Nice idea of using a normal cd for testing lazers.

[@matts2581]

That... ...was awesome. !!! :D TY kindly for sharing your work with us. :)

[@Grimmjar]

What would be the distance from wall to diffraction grating if you measure 640mm for a 640nm laser?

[@Jc-cv2ug]

It's great seeing some math in your videos! I love watching all the information gather into a useful measurement!!!!

[@XANApwns]

Well done as always, Brian. Always a pleasure to see a KZbin email telling me you've uploaded a video. I know you've got your next video or two planned out, but may I request some electrical content soon? I'm into my second semester currently of electronics and electrical engineering and I'm learning about all sorts of fascinating things I've always been interested in. It would be nice to see a Brainiac video that I could put some of my newfound knowledge to the test in.

[@brainiac75]

Thanks for having the notification bell on :) I am considering some high voltage stuff in the future - like tesla coils and such. I doubt I will make videos about electronics. I can recommend channels like bigclivedotcom and EEVblog for that.

[@skippylippy547]

Love your videos and subject matter. Thank you so much!

[@RaymondJerome]

cool. going to try this with my various lasers and CD, DVD, blueray, HDCD, magneto-optic, sega disk (which has different track spacing), laserdisk, video disk, various LP albums... many of which will not be blanks though and some that will have to be reflection setup.

[@Silexium]

Yet again you never fail to disappoint. Can't wait for your next video, Brian. It's going to be "attractive" ;)

[@zsombor_99]

Can I save a disc after a bit of reflective layer came off of it❓ Accidentally a piece of electrical tape fell onto an audio CD and come off with a bit from the reflective layer! Now I can't read that disc any more... ☹

[@anshul19]

Great video again. Love the science.😀

[@GMCLabs]

Thats cool, wanted to do this since your 1st video, but didn't want to buy a diffraction grate. Just tested this out my 532nm laser ended being 528nm using this method to measure. Close enough for me!

[@mordoc333]

Is it possible to concentrate such magnetic field with iron cone? A magnetic field that intense may do something interesting to matter

[@TheJuliusCo]

Hi, I see a 2L distance on the arctangent function to determine theta1 angle, rather I'd divide S1 by 2, to get the calculation right. Can someone clarify it for me? Tnks.

[@TheAtomTwister]

Red colored safety glasses as you probably know well are best for use with green lasers, yellow colored for blue and violet, blue colored for yellow, green colored for red.

[@brainiac75]

Yep, mine for red lasers are blue-colored though.

[@harbasslover6603]

Hi Brian I was wondering if you could explain why some metals can make alloys with some other metals but not with others. Thanks.

[@brainiac75]

I'm not an expert in metallurgy, but as with all chemistry I think the interchange of electrons is key. I believe you can mix all metals in some way, but for them to form a chemical microstructure (alloy), and not just a mixture, they should be compatible in atom size and electron structure. There are two ways an alloy can form: *Substitution alloys* Here one element simply replaces another. I believe the elements should have atoms of similar size and electron structure to do this. *Interstitial alloys* Here, elements with smaller atoms fit in between larger atoms in a crystalline structure. Atom size and electron structure must be important again for this to happen.

[@harbasslover6603]

Brainiac75 Thank you for the explanation .

[@rahuldwivedi1070]

I liked how he cut the dvd surface with a screw ripping the Man's zip😂

[@therezaloftus]

i really love your videos cant wait for the next one

[@HanshaniLavanya1]

4:48 I think that's not the case. 650 MiB = 681.5 MB. Then they rounded it up to 700MB. I guess

[@e5frog]

For your next calculation, try: 532 Exp -9

[@joepvanderkamp153]

How did you come up with this formula?

[@paultucker2027]

My math is a bit rusty, but can you change L to get wavelength directly from measurement, ie nm = mm measured ? Possibly requiring a curved measuring surface...

[@sidewind131258]

Damn, så var der en igen, lige som jeg skulle have Brainiac75 abstinenser :) Takker og bukker ærbødigt

[@cavemann_]

The more you know o.o

[@parody4042]

I love the silver long laser pointer you have

[@Jwh1o1]

Be careful with the Magnet looking forward to your next video!

[@fibulacat5025]

what kinda cd did you use i cant see defraction when i use a cd please reply me fast :(

[@VaporwaveSunset]

Can you do a video on sound waves? That would be SUPER awesome

[@brainiac75]

Hmm, have to think about how that could be interesting to show. I prefer to actually show things instead of just talking about it. It is possible to visualize sound waves though. Thanks for the suggestion. I'll put it in the pile of hundreds of videos I need to make :D

[@skitsschist11]

Awesome. Working with light in Physics now.

[@buzzlight1639]

sir I have a request ..plzz plzzz plzz do add english subtitles...it would be really helpful and beneficial for the one who are not native speaker of english...... subscribed your channel....it is just galaxy of knowledge... love and respect from India😊 I hope you will add in your upcoming videos..

[@brainiac75]

Uhm, there are English subtitles on this video? Just click the button next to the 'settings' gear wheel and voila! And thanks for the subscription - welcome aboard :)

[@fortunateson6070]

what about DVD-RW and Blue Ray if they even have rewritable blue rays?

[@brainiac75]

DVDs and Blurays are multilayered, so not recommended. You will need to split them into two very thin discs first. Much easier to just use a CD. Thanks for watching!

[@alexelias6277]

Hi!! Great video. I have a question about magnets, which magnet shape is stronger? A rectangular magnet or a circular magnet?

[@brainiac75]

Not really a difference between the rectangulars and circulars as such. Depends on what you want to be stronger. The field strength in tesla/gauss or the pull force in kg. Many factors to take into account - grade, volume, shape, form factor etc.

[@SayanMitraepicstuff]

Ahh, quantitative experiments... Thats some good stuff.

[@nikolassels5751]

Hey Braniac! I love your video's! It's amazing how much I learned about magnets and radioactivity with your videos! But, that intro, how do you make that? Thanks for making vids!

[@brainiac75]

Thanks :D The logo intro? It's basically individual pictures of the warning signs I animate in the video editor. The waving black background is just a looped stock video.

[@nikolassels5751]

And you move that with the editing program?

[@brainiac75]

Yes, the warning signs are 'animated' inside HitFilm Pro. Actually, I just keyframe their size and position even though HitFilm can do 3D too.

[@oleksandrkolomiyets3098]

Comprehensive and elegant