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Thread: audio reversal question

  1. #1 audio reversal question 
    Forum Freshman chrisdlugosz's Avatar
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    theory ---
    you move away from an audio source at the speed of sound - you will hear nothing because you are in stasis among the audio waves.

    experiment ---
    you move away from an audio source at TWICE the speed of sound - will you hear the audio in reverse because you are climbing your way through the waves in the wrong order? - and this wrong order is passing over you at one times speed of sound


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  3. #2  
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    As you accelerate away from an audio source you will experience the dopplar effect, yes, at the speed of sound you will theoretically not hear the source, at twice the speed of sound you will theoretically hear the sound played backwards till the point it was switched on. THis will only occur if the sound was running for some period before you set off.

    In practice you will probably hear nothing after a few milliseconds - 'windrush' will oercome anything you might have heard plus the sound level will drop with distance.


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  4. #3  
    Forum Sophomore Kabooom's Avatar
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    Whoa, that's pretty cool. Never thought of that heh, but obviously this must be hard to measure and prove.
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  5. #4  
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    Quote Originally Posted by Kabooom
    Whoa, that's pretty cool. Never thought of that heh, but obviously this must be hard to measure and prove.
    Nope, not hard to prove, drop a stone in a shallow pond and number the ripples as 1,2,3,4,5 etc say up to 100 now remember 1 was the first, so if after the 100th ripple you start running you will over take the ripples, count the ripple numbers as you go and you will be counting backwards till you get to 1, but anybody standing still or walking towards where the stone fell will be counting forwards, at normal speed, or faster if they are moving, If you start walking from the centre at the same speed as the ripples are moving you will stay with one and not cross any.

    Simple physics eh?.
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  6. #5  
    Forum Sophomore Kabooom's Avatar
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    Ahh, I see. Very true, no need to prove it by flying in a jet through sounds waves with a microphone . I just wish school would move faster, I'm so tired of being taught basic boring stuff and having no understanding of anything interesting.

    Sorry, not to thread hijack, but is upper physics (my definition; time dilation, quantum entanglement, etc.) even touched in High School?
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  7. #6  
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    Quote Originally Posted by Kabooom
    Ahh, I see. Very true, no need to prove it by flying in a jet through sounds waves with a microphone . I just wish school would move faster, I'm so tired of being taught basic boring stuff and having no understanding of anything interesting.

    Sorry, not to thread hijack, but is upper physics (my definition; time dilation, quantum entanglement, etc.) even touched in High School?
    Boring? yes, but esential, it's good practice for all those technical meetings you will attend in later life, by the way, if you do not fully understand 'basics' then probably end up selling hamburgers so stick at it, try livening it up by asking the questions teachers really hate, the one's they have to run to the library to answer, then while they are out you can subtely change the grammar on the blackboard and point it out when he gets back. THe more interesting YOU can make the lesson the more you WILL remember!

    I remember a lecturer in who's lab he had created complex polystyrene models of various aircraft and hung them from the ceiling, we students used to [while he was out] use soapy water to blow giant gas bubbles from the bunsen supply taps and er ignite them, as the flaming gas rose and went 'donut' shaped it would singe the models, by the end of term there wera a few black threads hanging, next year he would carve another set - it turned out he knew this was happening and just treated it as a game.
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  8. #7  
    Forum Sophomore Kabooom's Avatar
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    Yeah I understand the basic parts, but I go to a public school and they feed us this information so slowly. It's like a years worth of learning could be easily packed into a quarter.

    Quote Originally Posted by Megabrain
    I remember a lecturer in who's lab he had created complex polystyrene models of various aircraft and hung them from the ceiling, we students used to [while he was out] use soapy water to blow giant gas bubbles from the bunsen supply taps and er ignite them, as the flaming gas rose and went 'donut' shaped it would singe the models, by the end of term there wera a few black threads hanging, next year he would carve another set - it turned out he knew this was happening and just treated it as a game.
    Now that is hilarious.
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