Doc Schuster
I am very excited to tell you LOUDLY that there is a mechanical logarithm being calculated by your body!
Source
Similar Posts
44 thoughts on “Sound Intensity and Decibels Distinctly Defined, Dude | Doc Physics”
Comments are closed.
R
Chiii 😖
Great 💖
The amount of energy that a sound wave carries in one second
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.
It's log 10 so that you can give them in objective questions in which ratio is some power of 10
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 (https://youtu.be/cK2-6cgqgYA?t=2m55s), 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
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?
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?
Nice video. Please make a video for Noise Weighting
Boobs
Guys I'm Gonna Die I Need YOu Help I Have Ass Cancer
Intensity is basic or derived?
GREAT EXPLAINATION..
LOL camping is intense too
Your'e the best! i will be an engineer after thsi Board Exam!
very clear!!! like your video very much!!! love u!
thanks!
Can we then absorb intensity of sound to create concentrated energy
haha camping in tent city
nice lecture very helpful
how do you get radius what distance are you measuring? from you to the mic?
love your enthusiasm my friend 🙂
Cool!. I finally understood!!!
Did you missed primary education ?
sir i am big fan of urs ..u got super teaching skills . i have the subsvribed the only channel of urs only ..sir i have an urgent request ..plzz upload video an dB dBm dBμV and rest dB' s ..i just dont get anything while calculation and all ..Thank you sir
"I stuff breaks"!! Lol. This guy's hilarious
Can we hear temperature
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
thank you very much, great explanation. (y)
Good geometric explanation
Helpful yet concise. Thank you.
@ 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.
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?
Why is it frustrating to use log base10? Im being curious 🙂
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!
if we are looking for the Power?
Hi Doc, is it possible to calculate a 90 percentil from a set of leq readings?
شكراً … thanks
What kind of energy is it that you mentioned and how can I calculate it?
hahaha funny guy and great explanation!
I used to HATE physics and now I watched this and you just made me love it and interested in anything that you say <3 THANK YOU
I understood that far more than anything my lecturer ever said. Why I only finding this now when my exams tomorrow? 🙁
sir, can u help me with concepts of electric potential…. these videos are great help… thank you