I've always done this and nobody believed me! Now I've got an explanation >:)
Rockstar games now have an idea for Grand Theft Auto VI
I'm slightly confused
So he's saying that water is oscillating in phase with the car key waves, and this causes constructive interference? How is the water getting the energy to do that?
[QUOTE=Instant Mix;44267483]I'm slightly confused
So he's saying that water is oscillating in phase with the car key waves, and this causes constructive interference? How is the water getting the energy to do that?[/QUOTE]
I think it's because energy travels through solids the fastest, even if the energy is diluted. So in turn, the water moving in the same wavelengths as the car key signal sums up to a stronger wave.
This was showed on Top gear a very long time ago
[video=youtube;_jACSPipPSE]http://www.youtube.com/watch?v=_jACSPipPSE[/video]
This old dude is cool. I'm going to have to give this a try.
It also works putting it in your mouth.
[QUOTE=Tetsmega;44267717]I think it's because energy travels through solids the fastest, even if the energy is diluted. So in turn, the water moving in the same wavelengths as the car key signal sums up to a stronger wave.[/QUOTE]
Just because it goes through the medium at a faster speed ( wavelength and frequency changes due to conservation) does not mean it'll pick up energy.
going to have to ask my physics tutor about this one.
[QUOTE=Bucketboy;44267817]This was showed on Top gear a very long time ago[/QUOTE]
Yeah and if you would've watched the video, you would've known that he references Top Gear.
This video explains why the range is extended
right OK asked the physics tutor, he actually did know a bit about this saying there's actually been a few studies into it, but he does not know himself. He said it may have something to do with resonance but he's not too sure. He asked me to consider doing a project on it in third year.
[QUOTE=Instant Mix;44268116]Just because it goes through the medium at a faster speed ( wavelength and frequency changes due to conservation) does not mean it'll pick up energy.
going to have to ask my physics tutor about this one.[/QUOTE]
Electromagnetic waves travel at the speed of light through all matter, you're thinking of acoustic waves (although the frequency does [i]not[/i] change). Or maybe light, but that's explained due to the absorption and subsequent excitation of photons by the matter :smile:
[QUOTE=Instant Mix;44300761]right OK asked the physics tutor, he actually did know a bit about this saying there's actually been a few studies into it, but he does not know himself. He said it may have something to do with resonance but he's not too sure. He asked me to consider doing a project on it in third year.[/QUOTE]
Do it! And figure out what frequencies it works with, if it works with 2.4GHz I need never again lose my wireless signal.
Perhaps it works with phone frequencies.
Imagine.
[QUOTE=Instant Mix;44300761]right OK asked the physics tutor, he actually did know a bit about this saying there's actually been a few studies into it, but he does not know himself. He said it may have something to do with resonance but he's not too sure. He asked me to consider doing a project on it in third year.[/QUOTE]
The molecules just absorbs the waves from that direction. The molecules then radiate with the same phase giving you a dipole with constructive interference out of the line of the two 'poles'.
[editline]20th March 2014[/editline]
[QUOTE=chaz13;44302082]Electromagnetic waves travel at the speed of light through all matter, you're thinking of acoustic waves (although the frequency does [i]not[/i] change). Or maybe light, but that's explained due to the absorption and subsequent excitation of photons by the matter :smile:[/QUOTE]
If that were true there'd be no such thing as refractive index and you wouldn't see rainbows and stuff
Light refraction does not change the frequency of the waves though, it changes the wavelength - same with any refraction. As the speed of a wave changes, the product of the sound speed and the wavelength is a constant (frequency). :smile:
The time I first heard of it the explaination (mind you it was years ago) was that the head acts as a parabolic antenna. Of course with the water test that's pretty much disproven.
[QUOTE=ellibob;44302775]The molecules just absorbs the waves from that direction. The molecules then radiate with the same phase giving you a dipole with constructive interference out of the line of the two 'poles'.
[editline]20th March 2014[/editline]
If that were true there'd be no such thing as refractive index and you wouldn't see rainbows and stuff[/QUOTE]
So is it more of a resonance thing than constructive interference? in the same way that playing the sound of a wine glass being tapped at a high volume will resonante with the glass and cause it to shatter?
So basically the car key lock is resonanting at a natural frequency that the water likes and in turn is oscillating at the same frequency. How on earth does that invoke emitting radio waves though? some energy must come from somewhere in order for that amplified range.
this is genuinely really interesting from a quantum perspective, I might delve deeper into this.
[QUOTE=chaz13;44302969]Light refraction does not change the frequency of the waves though, it changes the wavelength - same with any refraction. As the speed of a wave changes, the product of the sound speed and the wavelength is a constant (frequency). :smile:[/QUOTE]
You are correct the frequency is constant. Therefore if the wavelength increases (which it does) the speed must decrease to give the same frequency (f=c/λ).
[editline]21st March 2014[/editline]
[QUOTE=Instant Mix;44303264]So is it more of a resonance thing than constructive interference? in the same way that playing the sound of a wine glass being tapped at a high volume will resonante with the glass and cause it to shatter?
So basically the car key lock is resonanting at a natural frequency that the water likes and in turn is oscillating at the same frequency. How on earth does that invoke emitting radio waves though? some energy must come from somewhere in order for that amplified range.
this is genuinely really interesting from a quantum perspective, I might delve deeper into this.[/QUOTE]
Well the method of absorption maybe but the range extension is purely an interference phenomenon.
[url]http://en.wikipedia.org/wiki/Dipole_antenna[/url]
You just get a maximum down the centre between the two 'things'.
I should also say that the waves emitted from the water will be much weaker as the water only absorbed a small amount of the initial energy and then re-emitted spherically in all directions.
I've tried this like for a bagajillion times when I was a kid and it never worked for me
[QUOTE=Matrix374;44307247]I've tried this like for a bagajillion times when I was a kid and it never worked for me[/QUOTE]
Maybe your brain has dried out.
I remember this working for me and being really useful at times.
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