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

[@CliveReyes]

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]

same here!

[@ellaboons320]

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

[@siyandamaseko2312]

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

[@kevinquincy4638]

Instablaster.

[@MrLegoBLACK]

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

[@lauelibre]

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

[@MZB80]

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

[@bianca6111]

"I need to calm down" lol

[@Maha-nx8fd]

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

[@soundtech7989]

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

[@nikismile123]

you are an outstanding teacher, respect !

[@shivensaini3643]

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

[@hyangsookhaleyjoe2120]

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]

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

[@kbnumber24]

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

[@skodamann]

Great explanation. And ur funny too!😂

[@Ayush-bk3rv]

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

[@thokozanimsimanga4041]

Awesome staff...You are talented mate.

[@nadianoormohamed4432]

Simply explained. Thank you.

[@benzook8898]

You have a gift for teaching

[@Govnaa]

Honestly the way you explain this is absolutely incredible.

[@dijonstreak]

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

[@lumusic1780]

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

[@sandiyy]

I love this video and am so grateful.

[@hefhef54321]

This needs more likes, seriously

[@andreasdekrout5209]

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).

[@ThefamousMrcroissant]

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

[@kevingutierrez38]

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

[@sciencewithfarazahmad]

Sir,very nice explanation!

[@RichardBronosky]

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

[@kebabhue]

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!

[@alifiskandar1998]

I love how detailed this video is❤

[@fatimasiddiqui705]

I understand log!!! You are a savior

[@saikiran4865]

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

[@mpopa5673]

Great video ! Thank you for explaining !!!

[@Ahmadabdal_]

THANKYOU SOOO SO MUCH

[@shahabstudio2099]

You are great explainer. Thank you

[@vytuong9425]

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

[@TH3_T3RM1N4T0R]

Fantastic explanation, thank you.

[@yukikoresawa8901]

Thank you so much. Awesome 😄

[@akshaykorlekar]

Wonderfully explained !! thank you !!

[@DJKrowbarKE]

Dude, you broke it down so well.

[@lordoffrickinasgard289]

Great teaching..funny too..😇

[@AluminumHaste]

Why doesn't this have 1 billion views?

[@pavanflow8492]

Im a music artist and i wa strying to understand sound basics. This helped me a lot to get my physics right. Thank you so much

[@TheChaosGamerWither715]

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

[@pakkinlaw4721]

Explanation Excellent ！Very 👍👍👍Clear ！

[@thedudebryce.453]

Very fun and simplified explanation! Very well done sir!

[@in3432]

Brilliant explanantion.

[@hrn8935]

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

[@PianoShawn]

best video for explaining the dB

[@batoolabuhlaiqa2052]

Loved it. Thank you so much.

[@faizansm8]

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.

[@linusnyqvist9298]

That was a great video!

[@sayantanghosh6714]

Great explanations! Thank you!

[@Funetic]

Excellent teacher.

[@sivas756]

Exellent video i have never seen

[@RulerExplosionMurder]

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

[@shoaibattar1476]

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

[@gaurav.raj.mishra]

Very understandable explanation.

[@ejdiii333]

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.

[@silasackerman8298]

Very good video! :)

[@loaishatnawi7578]

great really great

[@g7sky]

thx 4 explaining this

[@johnstephan7680]

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

[@fightington]

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

[@gussy-ps4he]

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

[@lunchtreyy]

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

[@97nikei55]

I am literally a potato trying to learn audio and after watching this, I think I’m just going to be a cleaner. He explains it so well but I’m so stupiiiiiiiiddd!

[@avinaash67mano10]

absolutely amazing video . Thanks .

[@calenbuford209]

Great video

[@maneshkumarofficial7536]

Thank you so Much Man.

[@hoangdustin1490]

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!

[@jeremiahguingab1556]

I understand it very well

[@chloe30551]

this is an excellent video. Thank you KA!

[@cousinsgoals4300]

Where did you get the 10?

[@iamjacobma]

Awesome vid thank you Sir!!!!

[@aliguraiffi9789]

You are the greatest

[@janahaquino492]

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

[@PatrickInCayman]

Awesome!

[@MahmoudGamal-io3hl]

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

[@ibrahimissaissa6627]

Thanks I enjoyed your explanation

[@armanish07626]

Some Heroes dont wear capes!

[@calebschmaus]

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

[@nibeditanayak4220]

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

[@jozefbeurut8908]

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

[@nickcampbell3812]

I am a bit curious since the formula is written out as : 10log(I/10^-12) which is equivalent to 10log(I) + 120 Normally I would think that addition is simpler than division involving powers of 10, but maybe there's another reason. In the example where the friends are yelling where I = 10^-5 W/m^2 You just take the -5 from the exponent, multiply by 10 and get -50 and add to 120 to get 70dB. You don't have to do division by powers of 10 with negative exponents, even though it is easy once you learn it.

[@philippchristou6856]

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]

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.

[@merik9535]

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

[@hjw5774]

Thank you - highly informative and well presented :)

[@apedits6259]

good, more videos plz

[@mazlumyalcinkaya]

Incredible, thank you

[@SamSmartt]

This formula is for sound intensity, but for measuring how loud a sound is at a specific point (e.g. our ear or a microphone) wouldn't we use the formula for Sound Pressure Level (SPL), which would be measured in Pascals instead of w/m^2? I would also love to hear an explanation of why in some contexts it's assumed +3dB is a doubling of volume but in other contexts people use +6dB? Still, this video is extremely well done.

[@swhit]

nice video -- great explanation, but i believe it is called a decibel because it is 1/10 of a bel, not because 'there is a ten in front of it'

[@praxisdev1884]

Wunderbar!

[@RizaShiro]

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

[@sudhindrap2786]

Thank you sir

[@MrMrdkey]

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

[@DanielCharlesSamuel]

Is that 70dBspl or 70dBsil ? Im confused.

[@devashishthapa3184]

Thanks

[@ManojKumar-cj7oj]

Logs can be used to scaling

[@4nerdsngeeks252]

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

[@diby1555]

1:49 that is a huge ear!

[@vaishnav4035]

Thanxs