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Post by delphicoracle on Mar 29, 2024 10:23:43 GMT
You could theoretically 'SEE' the conversation with you grandparents because information about every detail of that conversation is coded (interspersed) into the universe now. However, you cannot talk back and give them information from their future. I am using an extraordinarily strong version of the word 'theoretically' here - the information is there, but it would more or less be a technical impossibility to get it. I am not sure what you say and do is registered forever. There are only three states of mass that we know of...solids, liquids and gases. And the universe is made up only of mass, as far as we know. So we know these three are interchangeable and "mixable" but aural events are not mass. Neither is presence. IE the sand people stood on still exists but what they said and did on it in the past is not. Anymore than conversations between birds or whales remains in some cosmic library. |
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Post by montegriffo on Mar 29, 2024 10:50:22 GMT
You could theoretically 'SEE' the conversation with you grandparents because information about every detail of that conversation is coded (interspersed) into the universe now. However, you cannot talk back and give them information from their future. I am using an extraordinarily strong version of the word 'theoretically' here - the information is there, but it would more or less be a technical impossibility to get it. I am not sure what you say and do is registered forever. There are only three states of mass that we know of...solids, liquids and gases. And the universe is made up only of mass, as far as we know. So we know these three are interchangeable and "mixable" but aural events are not mass. Neither is presence. IE the sand people stood on still exists but what they said and did on it in the past is not. Anymore than conversations between birds or whales remains in some cosmic library. 4, there are also plasmas. |
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Post by equivocal on Mar 29, 2024 15:44:28 GMT
Time travels slower at sea level than it does on top of Mount Everest. It's why I choose to live in Suffolk, I'll live longer. Even if you don't, it'll seem like it. |
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Post by Orac on Mar 31, 2024 12:53:48 GMT
You could theoretically 'SEE' the conversation with you grandparents because information about every detail of that conversation is coded (interspersed) into the universe now. However, you cannot talk back and give them information from their future. I am using an extraordinarily strong version of the word 'theoretically' here - the information is there, but it would more or less be a technical impossibility to get it. I am not sure what you say and do is registered forever. There are only three states of mass that we know of...solids, liquids and gases. And the universe is made up only of mass, as far as we know. So we know these three are interchangeable and "mixable" but aural events are not mass. Neither is presence. IE the sand people stood on still exists but what they said and did on it in the past is not. Anymore than conversations between birds or whales remains in some cosmic library. I have to be a bit careful here because there is a sense in which you are absolutely correct. There is no practical way imaginable of retrieving the details of a 50 year-old conversation from (say) the atmosphere, so it can be reconstructed. However, in theoretical terms , the information is still there and is a component in the present positions and velocities of countless quadrillions of atoms. The past is theoretically retrievable (computable) from the present - it is, in a sense, part of the present |
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Post by delphicoracle on Mar 31, 2024 13:06:44 GMT
Is sound composed of atoms etc?
I understood that is why there is no sound in a vacuum.
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Post by Orac on Mar 31, 2024 13:08:46 GMT
Is sound composed of atoms etc? I understood that is why there is no sound in a vacuum. Yes - sound is atoms moving in waves |
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Post by delphicoracle on Mar 31, 2024 13:13:42 GMT
Oh. OK.
Atoms of what elements?
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Post by montegriffo on Mar 31, 2024 13:25:23 GMT
Oh. OK. Atoms of what elements? Air. Nitrogen, oxygen, hydrogen etc. |
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Post by Orac on Mar 31, 2024 13:26:28 GMT
Oh. OK. Atoms of what elements? It can be anything really Your voice is generated in your throat by pushing air through a small gap that makes a membrane vibrate and that vibration is carried through the air by waves of displacement - the atoms in the air move back and forth quickly. The displacement wave continues into solid materials and liquids. After you have spoken, things never return to exactly the way they were before you spoke - the future of billions of atoms is changed forever. Those changes could theoretically be traced back to reconstruct your voice. The same principle is used to create recordings. Your voice affects the microphone, which affects (say) iron particles in a tape cassette and the ultimate position of those iron particles can then be used to reconstruct (replay) your voice. |
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Post by delphicoracle on Apr 1, 2024 11:17:41 GMT
So sound isnt particles. It makes particles around it move.
I do doubt that those particles will ever realign and recreate sound in the past.
Thanks for the explanation. Another fact learned.
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Post by Zany on Apr 2, 2024 7:24:12 GMT
I am not sure what you say and do is registered forever. There are only three states of mass that we know of...solids, liquids and gases. And the universe is made up only of mass, as far as we know. So we know these three are interchangeable and "mixable" but aural events are not mass. Neither is presence. IE the sand people stood on still exists but what they said and did on it in the past is not. Anymore than conversations between birds or whales remains in some cosmic library. 4, there are also plasmas. Not to mention Mass and Energy are interchangeable. In a way we are only just beginning to grasp. With the help of the Higgs Boson. |
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Post by Zany on Apr 2, 2024 7:27:41 GMT
Is sound composed of atoms etc? I understood that is why there is no sound in a vacuum. Yes - sound is atoms moving in waves Not quite. Sound is a force that vibrates the atoms around it, that vibration is passed from atom to atom. As Delphicoracle says. |
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Post by Orac on Apr 2, 2024 10:45:48 GMT
Yes - sound is atoms moving in waves Not quite. Sound is a force that vibrates the atoms around it, that vibration is passed from atom to atom. As Delphicoracle says. You either misunderstand me or what sound is. There is no such thing as a disembodied 'force' - ie a force without a particle pushing Sound is a displacement wave - a displacement wave is particles displacing back and forth because the particle next to it has been moved back and forth...and so on..in a chain. |
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Post by Zany on Apr 2, 2024 19:28:27 GMT
Not quite. Sound is a force that vibrates the atoms around it, that vibration is passed from atom to atom. As Delphicoracle says. You either misunderstand me or what sound is. There is no such thing as a disembodied 'force' - ie a force without a particle pushing Sound is a displacement wave - a displacement wave is particles displacing back and forth because the particle next to it has been moved back and forth...and so on..in a chain. Agreed, I misunderstood you. |
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