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Sound Intensity and Decibels Distinctly Defined, Dude | Doc Physics

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

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44 thoughts on “Sound Intensity and Decibels Distinctly Defined, Dude | Doc Physics”

  5. 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.

  7. 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

  8. 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?

  26. 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

  33. @ 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.

  34. 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?

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