Sound Intensity and Decibels Distinctly Defined, Dude | Doc Physics

I am very excited to tell you LOUDLY that there is a mechanical logarithm being calculated by your body!

[@SoldOutSellOut]

I understood that far more than anything my lecturer ever said. Why I only finding this now when my exams tomorrow? :(

[@nicmorin407]

Two years later here I am at 1 am and my exam is tomorrow morning.

[@putt7515]

HAHAHAHAHAHAH FUCKING RELATABLE AF. 2 YEARS AGO THO. U PROBS GRADUATED

[@farfaraway6004]

My exam is 4 more hour from now😂😂 im so worried that i will fail this exam rip

[@Namajaff]

FarFarAway What happened? Did you fail?

[@farfaraway6004]

@@Namajaff thank god, i got B for physics haha i guess i was lucky that the exam questions were not too complicated😆

[@iamdarklegend611]

Says "Vibration" 06:17 - the marker in the left starts oscillating. Lecture level: Jedi

[@aishaalblooshi4278]

I miss these lesson in the class and I just saw these video and everything is clear now! Thank you 😊

[@narenks-jp7xz]

You are one of the best teachers in physics as far as I have seen This video helped me a lot

[@rsplaine]

Helpful yet concise. Thank you.

[@alejandrobohorquezpeniche521]

Wonderful, once again! I'm cramming for a Year 12 physics extended investigation I have due in two hours, aaand I didn't listen in class. So I'm making up for it!

[@BendylegsanDentyhead]

happy physics man is happy, thank you.

[@RaviGuptak]

Super thanks. You made it so easy to understand. I needed to understand sound and it's measurement for doing statistics on noise levels. This certainly helps and corrects the wrong I was doing.

[@jidfurikuri]

Great video! I missed this lecture in my physics class, and this really cleared things up for me!

[@DocSchuster]

YAY!

[@TheTheorizer]

What kind of energy is it that you mentioned and how can I calculate it?

[@linkeris7994]

very clear!!! like your video very much!!! love u!

[@Soumisoumsoum]

wow best teacher EVER ! wow.

[@NaksPizza]

love your enthusiasm my friend :)

[@DocSchuster]

Lovely question! He's using a different definition of the decibel that is more common in audio. If you'll consider wikipedia:Decibel, there's a nice table that relates decibels to power ratio in a general way that applies here. 0 dB means his speakers are getting a full power ratio of 1. -infinity dB, although not shown, means that his speakers will get no power. Also, up or down from his zero level is equivalent. It's like stretching or compressing a spring. Hope that helps.

[@redlulu123]

thank you sooo much, now I actually understand!

[@tusharsethiya2170]

GREAT EXPLAINATION..

[@1.4142]

This really vibrates my eardrums.

[@nabarajbaral2063]

The amount of energy that a sound wave carries in one second

[@sugagenius4356]

Cool!. I finally understood!!!

[@ditya3548]

Thanks!! This is really helpful

[@beakf1]

it helped a little and i like the spring analogy.I will look at that wiki link too :)

[@peterbryan3971]

Your'e the best! i will be an engineer after thsi Board Exam!

[@sultanalmazroui2874]

thank you very much, great explanation. (y)

[@alafifii79m71]

شكراً ... thanks

[@udayakumarmuniyasamy1394]

Nice video. Please make a video for Noise Weighting

[@DocSchuster]

I think these are relative measurements for specific applications, not the physics definition I'm using here.

[@meowmix6401]

Good geometric explanation

[@tasleemzohra6796]

Best teacher ever🤗🤗

[@QuinnWaters]

thanks!

[@DocSchuster]

For instance, in my favorite audio editor, 0dB means that I'm not changing the amplitude of the signal. So it's neutral in that sense.

[@enzolong9085]

nice lecture very helpful

[@_ed9345]

"I stuff breaks"!! Lol. This guy's hilarious

[@crashsitetube]

I have several problems with the explanation given in this video for how sound works...which, unfortunately is the "official" version as taught in the school science curriculum. To zero in on one: @6:16 you state that sound is a vibration of air particles (with air as the propagating medum) and you suggest, with your pen, that they are vibrating in a longitudinal manner (changing position to be alternating closer and farther from the eardrum which they are near). So, I guess these air particles are imparting that vibration to the eardrum? What force(s) are acting on the particles to make them move toward the eardrum? And, perhaps more important, what force(s) make them move away from the eardrum? When the particles are moving away from the eardrum, how do they...pull(?) on the eardrum to make it move? To make it flex toward the sound source. In this video (kzbin.info/www/bejne/mXyVXmmZnNaaj6Mm55s), it seems to be working exactly as you describe it with the air particles "vibrating" (moving back and forth near the diaphragm), pushing and pulling on the diaphragm, making it move by some sort of sympathetic action. But, just as in your video, no explanation is even attempted to explain the forces acting on the air particles to make them vibrate nor is there any explanation of the forces acting on the diaphragm/eardrum to make either of them move. I would be interested (as I'm sure would others) to know just what is making those things move as they are shown to do (at least as can be hand-drawn or animated) and more importantly, how it actually works when sounds are present. salaphysics 070419

[@user-wd7uy4li8e]

Great 💖

[@CaptainFracture]

lol that intro xD

[@samadtaheri1352]

Good Explained! But whats difference between SPL and SIL and when we talk about Sound Level we are talking abot SPL or SIL or both?

[@shogunentertainment389]

how do you get radius what distance are you measuring? from you to the mic?

[@jdtaramona]

Thank you very much. Just two questions: (1) if a jet Aircraft is climbing and passing over a little town and is about 3000 ft of height, is going to be an Issue for people? That place also has mountains and is at 11000 ft of elevation. For me is not an issue. (2) have you hear about LabView? If so, what do you think about of use it for sound spectra analysis?

[@AnimeFriendship]

I used to HATE physics and now I watched this and you just made me love it and interested in anything that you say

[@gretawilliams8799]

AnimeFriendship FUCK OFF then

[@MysticMD]

Crayola!!!

[@becar200]

hahaha funny guy and great explanation!

[@maryaurelio1835]

But if we perceive noises as decibels what is the “volume” we put up and down in our tv or cell phone?

[@CalebWrightfunkofilming]

Can we then absorb intensity of sound to create concentrated energy

[@md.manzeralam6508]

It's log 10 so that you can give them in objective questions in which ratio is some power of 10

[@crashsitetube]

I'm a firm believer that "real" stuff takes precedence over mathematically derived stuff. BNSF rails pass by my house and just over a mile at the closest. I can clearly hear the horn on the locomotive. I can not just hear it, I can record it (analog or digital) and get a playback that's about as loud as I heard it. I know there is nothing in the recorder that has any logarithmic characteristics. Thoughts? On a related side note, why don't the compressions and rarefactions of the longitudinal sound waves diffuse in the 5+ seconds it takes for the sound to reach me?

[@davidcano10]

Hi Doc, is it possible to calculate a 90 percentil from a set of leq readings?

[@Alex-sm3ct]

+david cano Yes. You can calculate the 90th percentile of any data range, including a range of leq readings. Note the acoustic term "L90" is actually the mathematical 10th percentile. Excel has an easy percentile function you can look up.

[@beakf1]

I wonder if you can answer a question about decibels i have on someone elses video explanation that i dont get.If you type in decibel to u tube at the very top is an example by war beats for audio.He shows a wave and says the middle is -INFdB 0.00 then goes up from it too -0.00db and then back to the centre -INFdB 0.00 and then down to - 0.00dB.So far i learned that - INFdb 0.00 is no sound.So i can understand how going up from that to 0.00db reaches maximum for computer...but continued

[@LongDistanceFour]

0.00dB is a neutral level. Sounds like the sound was travelling in a panning effect while maintaining a neutral sound level. Someone correct me if I'm wrong.

[@TheRoyceCraft]

Can we hear temperature

[@beakf1]

sorry continued here....if he goes back down to -INFdB and then carrys on down how can it be getting louder if silence is in the middle and loud is up then down should just be nothing like turning a volume knob.I hope you can help because i really need to understand this before i move on.

[@ronaldcalderon9391]

if we are looking for the Power?

[@DocSchuster]

+Keven Cantoral The Power of Castle Grayskull?

[@mmshohidulislamlitu5338]

in school we learnt that the lowest frequency we hear is 20hz.what's the relation between 20hz and 10 ^_12.and when intensity depends on r,why there is no r in I=2p(rho)π^2a^2f^2v

[@tsvasekar]

no relation you can have sound signal with 120 dB having frequency 20 Hz.... frequency and loudness are two completely different and independent things...

[@divyamgarg9078]

sir, can u help me with concepts of electric potential.... these videos are great help... thank you

[@DocSchuster]

photon n That is a very tricky topic. I have made a few videos on it - I hope they help.

[@divyamgarg9078]

ok thnx sir... i'll browse it

[@crashsitetube]

@ about 3:45 to 4:00 You ask if we would "agree". I do not agree. If we try to follow your mathematically derived explanation, we're forced to conclude that, like the eardrum, a (dynamic) microphone diaphragm must also give a usable output when it moves only the width of a molecule. See my previous post that was ignored/overlooked/too-wrong-for-consideration. We need a better description of how sound propagates than is taught in the school science curriculum.

[@phenomenalphysics3548]

is it only me or beta looks like hearts sometimes

[@LongDistanceFour]

or is it +15.00 dB that's neutral...I can't remember now.

[@seraphinemoncada5371]

LOL camping is intense too

[@marijavaitke89]

Got it. Easy as pi. ;-)

[@DocSchuster]

Maybe 4pi...

[@ssaannttiibbYT]

Why is it frustrating to use log base10? Im being curious :)

[@DocSchuster]

+Santiago Bañuelos It's just unnatural. A silly consequence of having five fingers on each hand. My father was killed by a six-fingered man.

[@tsvasekar]

It's for sake of calculations... it is easy to calculate when it comes in power of 10.... most of sound level we write are like -10dB, 30dB, 60dB, etc..... so it'd been very difficult to write it down in natural log(ln function on any scientific calculator) system...

[@violinsheetmusicblog]

Why do you think ln is better than log?

[@DocSchuster]

It's like bare feet in the summer!

[@andrewloera5641]

haha camping in tent city

[@beakf1]

sorry actually his is the 6th video down if you type into u tube decibels it will have mastering decibels war beats tutorial.

[@THEDragonTechnoGamer]

Guys I'm Gonna Die I Need YOu Help I Have Ass Cancer

[@mkhanstar9552]

Intensity is basic or derived?

[@rajank1050]

R

[@neeraj3800]

Chiii 😖

[@manmathnathmallick2910]

Did you missed primary education ?