Saber Posted June 17, 2023 Share Posted June 17, 2023 The thought of extracting sound from objects brought up some other questions When two or more electromagnetic waves collide they mix with each other And form a result wave @ the point of collision and then they continue to go as they were before the collision right ? Is it possible that after the collision they each hold information about the collision like the place ( distance from the point of observation ) of collision or the characteristics of the other waves it had collided with ? Link to comment Share on other sites More sharing options...
Genady Posted June 17, 2023 Share Posted June 17, 2023 1 hour ago, Saber said: The thought of extracting sound from objects brought up some other questions When two or more electromagnetic waves collide they mix with each other And form a result wave @ the point of collision and then they continue to go as they were before the collision right ? Is it possible that after the collision they each hold information about the collision like the place ( distance from the point of observation ) of collision or the characteristics of the other waves it had collided with ? Yes, they just go through each other. No, they don't interact. 1 Link to comment Share on other sites More sharing options...
Saber Posted June 17, 2023 Author Share Posted June 17, 2023 40 minutes ago, Genady said: Yes, they just go through each other. No, they don't interact. Dont they add up to each other and form a form of result wave @ the point of collision ? Link to comment Share on other sites More sharing options...
Genady Posted June 17, 2023 Share Posted June 17, 2023 19 minutes ago, Saber said: Dont they add up to each other and form a form of result wave @ the point of collision ? Yes, at any point in spacetime where the two waves are present, the resulting field is the sum of two fields. Each one of the two waves continues unchanged. They do not "collide". Their effects simply add up. Link to comment Share on other sites More sharing options...
Saber Posted June 17, 2023 Author Share Posted June 17, 2023 (edited) 1 hour ago, Genady said: Yes, at any point in spacetime where the two waves are present, the resulting field is the sum of two fields. Each one of the two waves continues unchanged. They do not "collide". Their effects simply add up. Thanx.... Do physical waves like sound waves that are compressional ( longitudinal ) waves also follow that ? Edited June 17, 2023 by Saber Link to comment Share on other sites More sharing options...
Genady Posted June 17, 2023 Share Posted June 17, 2023 4 minutes ago, Saber said: Thanx.... Do physical waves like sound waves that are compressional ( longitudinal ) waves also follow that ? I think, they do in the first approximation. But generally, they are more complex because there are other internal forces in the fluids. 1 Link to comment Share on other sites More sharing options...
studiot Posted June 17, 2023 Share Posted June 17, 2023 6 hours ago, Saber said: The thought of extracting sound from objects brought up some other questions Two facts about sounds for you to research. Firstly the sounds that create intelligible (human and i think other species) 'speech' are not the sort of sound wave you would see on an oscilloscope trace of say an orchestra. That is some sort of amplitude trace of varying frequency or frequencies. They are what is known as pulse code modulated. The information is actually contained in bursts or pulses which are pretty well independent of either frequency or amplitude. Secondly sound waves, whether pulse or continuous, do not substantially impinge on bulk objects to create measurable and lasting traces. But geologists recognise that waves can be literally cast in stone in slow sedimentation processes. As fine grained sediment settles, compacts and eventually solidifies it can bear the effects of gently passing waves. These are called ripple marks in the bedding. 1 Link to comment Share on other sites More sharing options...
Saber Posted June 19, 2023 Author Share Posted June 19, 2023 spam link removed shortened link removed Link to comment Share on other sites More sharing options...
Genady Posted June 19, 2023 Share Posted June 19, 2023 I'd like to know what you've posted, but I can't, because a) I'd have to follow the link, which is against the rules, and b) the link is a URL shortener, which is not advised to follow. Link to comment Share on other sites More sharing options...
Saber Posted June 19, 2023 Author Share Posted June 19, 2023 (edited) 5 hours ago, Genady said: I'd like to know what you've posted, but I can't, because a) I'd have to follow the link, which is against the rules, and b) the link is a URL shortener, which is not advised to follow. I dont know why it was removed it was a video showing that using a wave detector device the send & receive Wifi signals & waves normal ordinary modems can be used like a radar to picture a 3d model out of your house and any stationary or moving object that is in it......including humans living in it....... Edited June 19, 2023 by Saber Link to comment Share on other sites More sharing options...
swansont Posted June 19, 2023 Share Posted June 19, 2023 1 hour ago, Saber said: I dont know why it was removed it was a video showing that using a wave detector device the send & receive Wifi signals & waves normal ordinary modems can be used like a radar to picture a 3d model out of your house and any stationary or moving object that is in it......including humans living in it....... ! Moderator Note No, it didn’t. You must have pasted the wrong link. Your link went to video entitled “Didnt realize how fcked we are” and it spoke about reading thoughts or some such. Rule 2.7 says, in part: members should be able to participate in the discussion without clicking any links or watching any videos. Videos and pictures should be accompanied by enough text to set the tone for the discussion, and should not be posted alone which you did not follow. Link to comment Share on other sites More sharing options...
studiot Posted June 19, 2023 Share Posted June 19, 2023 16 hours ago, Saber said: spam link removed shortened link removed I tried the link, and was taken to a comedy website. But because I am lucky enough to be using an old pc the website did not work for me just displaying the address and a blank page. However what you describe in you next post does not constitute waves impinging on material objects to create a permanent image of the wave. Sure you can record readings and plot them, but that is your observations creating the permanent image, not the wave itself. 1 hour ago, Saber said: I dont know why it was removed it was a video showing that using a wave detector device the send & receive Wifi signals & waves normal ordinary modems can be used like a radar to picture a 3d model out of your house and any stationary or moving object that is in it......including humans living in it....... Link to comment Share on other sites More sharing options...
Saber Posted June 19, 2023 Author Share Posted June 19, 2023 (edited) 54 minutes ago, swansont said: No, it didn’t. You must have pasted the wrong link. Your link went to video entitled “Didnt realize how fcked we are” and it spoke about reading thoughts or some such. If you would ignore that part that also was talking about a device that could decode brain activity waves and reconstruct approximately and not precisely the thoughts the person had...........it was a 10-15 second of talking about that...then the rest of the clip was about the thing i mentioned . 54 minutes ago, swansont said: members should be able to participate in the discussion without clicking any links or watching any videos. Videos and pictures should be accompanied by enough text to set the tone for the discussion, and should not be posted alone I think you as a mod could see the parts of the post i edited.............i wrote some of my ideas about it but i feared that the mods or other people would be upset and tell me dont talk about your ideas with out evidence......so i edited the post and preferred to not write anything......to see what others think and say about it..... 44 minutes ago, studiot said: I tried the link, and was taken to a comedy website. But because I am lucky enough to be using an old pc the website did not work for me just displaying the address and a blank page. I downloaded it and put it in one of my telegram channels if the Mods would give me the permision i could put the link here..... Edited June 19, 2023 by Saber Link to comment Share on other sites More sharing options...
swansont Posted June 19, 2023 Share Posted June 19, 2023 37 minutes ago, Saber said: I think you as a mod could see the parts of the post i edited No, not after you edited them. We don’t track that. Quote the rest of the clip was about the thing i mentioned But you just posted the link, and did not convey this information in text, as required by the rules. And, as studiot notes, it’s a comedy site. There’s no way to fast-forward through the video (on my iPad, at least), so one must waste time wading through nonsense to get to the salient point, and no info about who the person giving the talk is. There’s no credibility offered here. Just the prospect of wasted time. 1 Link to comment Share on other sites More sharing options...
Saber Posted June 19, 2023 Author Share Posted June 19, 2023 (edited) By the way a question Can waves that have a higher energy level thus can move further and through denser objects.........carry other waves with lower energy levels with in themselves.... And carry those other waves to distances or through objects that they themselves normally cant ? Basically can waves carry other waves ? Edited June 19, 2023 by Saber Link to comment Share on other sites More sharing options...
Genady Posted June 20, 2023 Share Posted June 20, 2023 32 minutes ago, Saber said: By the way a question Can waves that have a higher energy level thus can move further and through denser objects.........carry other waves with lower energy levels with in themselves.... And carry those other waves to distances or through objects that they themselves normally cant ? Basically can waves carry other waves ? It doesn't make sense to go on with this vague language. The only way to ask and to answer meaningfully is to use mathematics. Check, e.g., Fourier series. Link to comment Share on other sites More sharing options...
Saber Posted June 20, 2023 Author Share Posted June 20, 2023 38 minutes ago, Genady said: It doesn't make sense to go on with this vague language What do you mean by vague ? Did i Upset you again ? Link to comment Share on other sites More sharing options...
Genady Posted June 20, 2023 Share Posted June 20, 2023 6 minutes ago, Saber said: What do you mean by vague ? Did i Upset you again ? No, you didn't upset me. By vague I mean that answers depend on what you refer to as wave and as wave carrying wave. Link to comment Share on other sites More sharing options...
Saber Posted June 20, 2023 Author Share Posted June 20, 2023 1 minute ago, Genady said: No, you didn't upset me. By vague I mean that answers depend on what you refer to as wave and as wave carrying wave. i had a book in early 90's it illustrated in it that certain radio waves can act as a carrier wave for other waves It was some thing like this... Link to comment Share on other sites More sharing options...
Genady Posted June 20, 2023 Share Posted June 20, 2023 5 minutes ago, Saber said: i had a book in early 90's it illustrated in it that certain radio waves can act as a carrier wave for other waves It was some thing like this... OK, this looks like the Fourier series I've mentioned. Any wave can be decomposed into a sum of weighted sinusoidal waves. Each component wave behaves independently, and the resulting wave behaves as their sum. The component waves do not affect each other. 1 Link to comment Share on other sites More sharing options...
Saber Posted June 20, 2023 Author Share Posted June 20, 2023 6 minutes ago, Genady said: OK, this looks like the Fourier series I've mentioned. Any wave can be decomposed into a sum of weighted sinusoidal waves. Each component wave behaves independently, and the resulting wave behaves as their sum. The component waves do not affect each other. thanx Link to comment Share on other sites More sharing options...
Mordred Posted June 20, 2023 Share Posted June 20, 2023 (edited) 2 hours ago, Genady said: OK, this looks like the Fourier series I've mentioned. Any wave can be decomposed into a sum of weighted sinusoidal waves. Each component wave behaves independently, and the resulting wave behaves as their sum. The component waves do not affect each other. Added detail this is also applied to superposition of wavefunctions in QM and QFT. The superimposed wavefunction is the sum of all wavefunctions. The collapse occurs when you examine one of the component wavefunctions in a nutshell. (using similar grammar as Genady). Though in QM and QFT these would be probability wavefunctions. Not to be confused with physical waveforms. Edited June 20, 2023 by Mordred Link to comment Share on other sites More sharing options...
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