Decibel Scale | Mechanical waves and sound | Physics | Khan Academy
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- Опубликовано: 30 июн 2014
- We often use this logarithmic scale to describe the intensity of sound. Created by David SantoPietro.
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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.
same here!
this video is amazing. absolutely amazing. I finally understand the whole decibel thing
I could not agree with you more, this guy is awesome
Instablaster.
I swear only if i had a teacher as good as this guy in delivering the information i woldnt have needed to study
IDK how i'd be able to pass all these years without khan academy and youtube!
you're awesome
Hands down, this is the best ever*10^100 definition of decibel I heard so far.
hahaha i wish you had taught me logs 5 years ago when i learnt them, this is so great
@TheGodEmperorofMankind because refreshers can be needed after 5yrs or they were never truly understood the firs time around, merely memorised by rote?
2020 and still listening. First time I really understood decibels.
"I need to calm down" lol
I love the nerd-like joking around and the brilliant explanation of how Log works, finally understood it, you're the man!
you are an outstanding teacher, respect !
made it so easy, I was struggling with it... thank you
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!
Awesome, thank you for the explanation, very easy to understand !
Loved it. Thank you so much.
Such a friendly approach to explaining dB. Motivated teacher, funny and great analogies. Just a really, really well done explanation overall.
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!!
yes - just noted that too (same field :) )
...by far...thee best, clearest, simple well-defined explanation i have EVER encountered...i DEFINITELY got it......whew ...finally ...thank you SO much....!!
Awesome staff...You are talented mate.
Honestly the way you explain this is absolutely incredible.
Just beautiful..and such a great way to explain it!! Thanks!!!
I love this video and am so grateful.
Simply explained. Thank you.
I'm glad I've finally understand dB, after tens of videos and explanations!
I watched 3 videos before this one and none of them actually explained it, thank you!!
Thank you Dr. Khan. Your competence is fresh air and your delivery superb. I finally clearly understand the dB scale.
I love this video. Dang you are a great teacher. Finally, there is someone makes me like physics a little bit.
This might be the first time ,I understood a concept in just a single watch
Thank you so much. Awesome 😄
Great explanations! Thank you!
this is an excellent video. Thank you KA!
Thank you sooo much, your explanation was very clear, and I even felt like physics is not that bad after all :)
Thank you, Awesome. so easy explain. I finally understand the whole decibel thing so many years later kkkk
Dude, you broke it down so well.
Great video ! Thank you for explaining !!!
Wonderfully explained !! thank you !!
thx 4 explaining this
Incredible, thank you
I understand log!!! You are a savior
Perfect explain, thank Mr.
absolutely amazing video . Thanks .
You are great explainer. Thank you
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!
Awesome vid thank you Sir!!!!
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).
Very fun and simplified explanation! Very well done sir!
Wow.
I love how detailed this video is❤
Thank you - highly informative and well presented :)
Fantastic explanation, thank you.
This needs more likes, seriously
Thank you so much. I don't know why our teachers aren't straightforward like this...
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.
THANK YOU THANK YOU SO SO MUCH!!!!!
You have a gift for teaching
Awesome!
Thanks I enjoyed your explanation
Sir,very nice explanation!
Thank you so Much Man.
THANKYOU SOOO SO MUCH
Explanation Excellent ！Very 👍👍👍Clear ！
Utile..Exellent Explication
Ths ..so..Much
Brilliant explanantion.
Wow! 2:20 - 4:20 really is mind blowing.
Thanxs
Very understandable explanation.
I understand it very well
best video for explaining the dB
That was a great video!
Exellent video i have never seen
Wunderbar!
Excellent teacher.
you are awesome
I am in 7th class ans still understood it which is huge. You are the best teacher
Thank you sir
great really great
Very good video! :)
You are a god given teacher!! My god, i just learned some serious shit and refreshed 10 years of school in 5 minutes!!!!
Thank u
You are the greatest
Great video
thank u
Great teaching..funny too..😇
Thanks
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!
good, more videos plz
Why doesn't this have 1 billion views?
whats the difference between (octave, sone, hertz, decibel) thak u for the video
I laughed a lot during this one haha....I also learned some stuff too! hehe :)
Some Heroes dont wear capes!
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.
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.
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
Does the weight of an object affect the decibels it creates when hitting another object?
9:33 you forgot to the base 10 for the log but other than that a clear video
The only place I saw the letters D and B together before this video was on the back of an aston martin.....
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.
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.
ok that bit with the 1W of power spread over an area blew my freaking mind. That's insane to think about
thanks for concept ...but u said decible scale where it is?
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'