Decibel Scale | Mechanical waves and sound | Physics

Decibel Scale | Mechanical waves and sound | Physics | Khan Academy

Рет қаралды 358,587

10 жыл бұрын

We often use this logarithmic scale to describe the intensity of sound. Created by David SantoPietro.
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Пікірлер: 155

@CliveReyes 3 жыл бұрын

I am 31 years old with BSc. in electronics engineering and 8+ years of experience in wireless communications and this is truly the most brief and beautiful explanation of decibels I have ever come across.

@chessmaniac17 4 ай бұрын

same here!

@ellaboons320 7 жыл бұрын

this video is amazing. absolutely amazing. I finally understand the whole decibel thing

@siyandamaseko2312 3 жыл бұрын

I could not agree with you more, this guy is awesome

@kevinquincy4638 2 жыл бұрын

Instablaster.

@MrLegoBLACK 5 жыл бұрын

I swear only if i had a teacher as good as this guy in delivering the information i woldnt have needed to study

@Maha-nx8fd 8 жыл бұрын

IDK how i'd be able to pass all these years without khan academy and youtube! you're awesome

@bianca6111 6 жыл бұрын

"I need to calm down" lol

@lauelibre 7 жыл бұрын

hahaha i wish you had taught me logs 5 years ago when i learnt them, this is so great

@MZB80 4 жыл бұрын

@TheGodEmperorofMankind because refreshers can be needed after 5yrs or they were never truly understood the firs time around, merely memorised by rote?

@soundtech7989 4 жыл бұрын

I love the nerd-like joking around and the brilliant explanation of how Log works, finally understood it, you're the man!

@kbnumber24 4 жыл бұрын

2020 and still listening. First time I really understood decibels.

@shivensaini3643 2 жыл бұрын

Hands down, this is the best ever*10^100 definition of decibel I heard so far.

@lumusic1780 7 жыл бұрын

Awesome, thank you for the explanation, very easy to understand !

@nikismile123 5 жыл бұрын

you are an outstanding teacher, respect !

@saikiran4865 7 жыл бұрын

made it so easy, I was struggling with it... thank you

@kebabhue 9 жыл бұрын

Thank you! I'm in medicine and looking at ENT right now. Had some problem with understanding the dB concept but also liking physics from back in the day I now get it!

@gussy-ps4he 6 жыл бұрын

Just beautiful..and such a great way to explain it!! Thanks!!!

@ThefamousMrcroissant 3 жыл бұрын

Such a friendly approach to explaining dB. Motivated teacher, funny and great analogies. Just a really, really well done explanation overall.

@batoolabuhlaiqa2052 8 жыл бұрын

Loved it. Thank you so much.

@thokozanimsimanga4041 8 жыл бұрын

Awesome staff...You are talented mate.

@Ayush-bk3rv 3 жыл бұрын

This might be the first time ,I understood a concept in just a single watch

@chloe30551 5 жыл бұрын

this is an excellent video. Thank you KA!

@nadianoormohamed4432 6 жыл бұрын

Simply explained. Thank you.

@dijonstreak 4 жыл бұрын

...by far...thee best, clearest, simple well-defined explanation i have EVER encountered...i DEFINITELY got it......whew ...finally ...thank you SO much....!!

@Govnaa Жыл бұрын

Honestly the way you explain this is absolutely incredible.

@sandiyy 5 жыл бұрын

I love this video and am so grateful.

@johnstephan7680 3 жыл бұрын

Thank you Dr. Khan. Your competence is fresh air and your delivery superb. I finally clearly understand the dB scale.

@vytuong9425 3 жыл бұрын

I love this video. Dang you are a great teacher. Finally, there is someone makes me like physics a little bit.

@merik9535 4 жыл бұрын

Thank you, Awesome. so easy explain. I finally understand the whole decibel thing so many years later kkkk

@RizaShiro 6 жыл бұрын

Thank you sooo much, your explanation was very clear, and I even felt like physics is not that bad after all :)

@mpopa5673 Жыл бұрын

Great video ! Thank you for explaining !!!

@sayantanghosh6714 3 жыл бұрын

Great explanations! Thank you!

@kevingutierrez38 3 ай бұрын

I'm glad I've finally understand dB, after tens of videos and explanations!

@hjw5774 3 жыл бұрын

Thank you - highly informative and well presented :)

@akshaykorlekar 4 жыл бұрын

Wonderfully explained !! thank you !!

@thedudebryce.453 4 жыл бұрын

Very fun and simplified explanation! Very well done sir!

@avinaash67mano10 5 жыл бұрын

absolutely amazing video . Thanks .

@yukikoresawa8901 8 жыл бұрын

Thank you so much. Awesome 😄

@mazlumyalcinkaya 5 жыл бұрын

Incredible, thank you

@DJKrowbarKE 7 жыл бұрын

Dude, you broke it down so well.

@iamjacobma 5 жыл бұрын

Awesome vid thank you Sir!!!!

@g7sky 8 жыл бұрын

thx 4 explaining this

@hoangdustin1490 4 жыл бұрын

Thank you! You just solve the mystery of logarith that I have e nightmare with in the last 17 years. I have no idea why physicts just put log there!

@fatimasiddiqui705 6 жыл бұрын

I understand log!!! You are a savior

@wapasela Жыл бұрын

Perfect explain, thank Mr.

@shahabstudio2099 7 ай бұрын

You are great explainer. Thank you

@RulerExplosionMurder Жыл бұрын

I watched 3 videos before this one and none of them actually explained it, thank you!!

@andreasdekrout5209 Жыл бұрын

A very good explanaition. Just one little thing, that might get overlooked. dB is a relative measure (like octaves in music). Only by using a fixed base value (here you use the "smallest hearable loudness") it becomes an absolute measure (like, how many notes is a tone higher or lower).

@pakkinlaw4721 Жыл бұрын

Explanation Excellent ！Very 👍👍👍Clear ！

@jozefbeurut8908 5 жыл бұрын

Utile..Exellent Explication Ths ..so..Much

@hyangsookhaleyjoe2120 4 жыл бұрын

An Audiology student brushing up on logarithm here. Wanted to clarify one thing: loudness is not the same as intensity. Intensity is the physical magnitude of sound pressure but loudness is perceived intensity. So the same intensity can have different loudness magnitude depending on individual. Other than that, it's very helpful! Thank you!!

@MZB80 4 жыл бұрын

yes - just noted that too (same field :) )

@TH3_T3RM1N4T0R 5 ай бұрын

Fantastic explanation, thank you.

@sciencewithfarazahmad Жыл бұрын

Sir,very nice explanation!

@alifiskandar1998 7 ай бұрын

I love how detailed this video is❤

@ibrahimissaissa6627 5 жыл бұрын

Thanks I enjoyed your explanation

@PatrickInCayman 4 жыл бұрын

Awesome!

@linusnyqvist9298 3 жыл бұрын

That was a great video!

@gaurav.raj.mishra 5 жыл бұрын

Very understandable explanation.

@sivas756 6 жыл бұрын

Exellent video i have never seen

@pulkitsinha3736 7 жыл бұрын

Wow.

@in3432 2 жыл бұрын

Brilliant explanantion.

@PianoShawn 6 жыл бұрын

best video for explaining the dB

@RichardBronosky 7 жыл бұрын

Wow! 2:20 - 4:20 really is mind blowing.

@benzook8898 5 жыл бұрын

You have a gift for teaching

@faizansm8 3 жыл бұрын

I wish I had this when I was in college. Now I am field engineer and I have to refer to the basics every now and then. I deal in optics mostly.

@maneshkumarofficial7536 5 жыл бұрын

Thank you so Much Man.

@Funetic Ай бұрын

Excellent teacher.

@janahaquino492 6 жыл бұрын

THANK YOU THANK YOU SO SO MUCH!!!!!

@weirdowearingpants3104 Жыл бұрын

Thank you so much. I don't know why our teachers aren't straightforward like this...

@jeremiahguingab1556 7 жыл бұрын

I understand it very well

@silasackerman8298 7 жыл бұрын

Very good video! :)

@Ahmadabdal_ 6 жыл бұрын

THANKYOU SOOO SO MUCH

@hefhef54321 6 жыл бұрын

This needs more likes, seriously

@maanasmathengeorge627 8 жыл бұрын

you are awesome

@TheChaosGamerWither715 3 жыл бұрын

I am in 7th class ans still understood it which is huge. You are the best teacher

@lordoffrickinasgard289 4 жыл бұрын

Great teaching..funny too..😇

@praxisdev1884 9 ай бұрын

Wunderbar!

@calenbuford209 5 жыл бұрын

Great video

@hrperformance 5 жыл бұрын

I laughed a lot during this one haha....I also learned some stuff too! hehe :)

@loaishatnawi7578 2 жыл бұрын

great really great

@fightington 3 жыл бұрын

You are a god given teacher!! My god, i just learned some serious shit and refreshed 10 years of school in 5 minutes!!!!

@vaishnav4035 6 жыл бұрын

Thanxs

@lunchtreyy Жыл бұрын

ok that bit with the 1W of power spread over an area blew my freaking mind. That's insane to think about

@aliguraiffi9789 5 жыл бұрын

You are the greatest

@sudhindrap2786 6 жыл бұрын

Thank you sir

@apedits6259 7 жыл бұрын

good, more videos plz

@jjreddick377 8 ай бұрын

Thank u

@ejdiii333 4 жыл бұрын

My Brain hurts, The more math based videos I watch, the more I know math is my weakness. I just cannot wrap my mind around anything beyond basic math, no matter how hard I try.

@brianchedrawi2996 6 жыл бұрын

thank u

@4nerdsngeeks252 6 жыл бұрын

whats the difference between (octave, sone, hertz, decibel) thak u for the video

@devashishthapa3184 5 жыл бұрын

Thanks

@AluminumHaste 2 жыл бұрын

Why doesn't this have 1 billion views?

@MrMrdkey 3 жыл бұрын

Man... im a brazillian guy and i have a poor english, very basic... And you was capable of teach me about the fucking LOG and decibels You are amazing... thanks

@cousinsgoals4300 6 жыл бұрын

Where did you get the 10?

@hrn8935 2 жыл бұрын

9:33 you forgot to the base 10 for the log but other than that a clear video

@shoaibattar1476 3 жыл бұрын

thanks for concept ...but u said decible scale where it is?

@philippchristou6856 7 жыл бұрын

Hey, I have a question I could not find an answer anywhere. So , I know that adding decibels means Leq = 10*log10(Sum(10^(Li/10))) . But what if I want to add different frequencies ?? Does the equation still apply ?

@MZB80 4 жыл бұрын

different frequencies would affect the pitch, not the volume. amplitude is related to volume, frequency to pitch. decibels measure volume / loudness (which is a subjective perception of volume that changes between individuals). so yes - the equation would still apply as long as the amplitude is constant.

@calebschmaus 6 жыл бұрын

Does the weight of an object affect the decibels it creates when hitting another object?

@sreeharshaparuchuri756 6 жыл бұрын

The only place I saw the letters D and B together before this video was on the back of an aston martin.....

@nibeditanayak4220 6 жыл бұрын

Hey how is it possible. It must log substitute 10 in 9:55

@MahmoudGamal-io3hl 4 жыл бұрын

At the end example, shouldn't it be 7 decibels or 70 bels?

@armanish07626 6 жыл бұрын

Some Heroes dont wear capes!

@c.q.illusion3198 2 жыл бұрын

I actually didn't like the equations at first, I do now. If my math teachers were like this, I certainly would've loved math. I'll be studying mechanical engineering and really wanted to backout. But because of this, no. It's interesting.