A fancy way of saying that microwaving rats makes them warmer and more comfortable. Now where's my $100K research grant?
Oddly enough, microwaving frozen mice was one of the very first non-radar applications of the microwave magnetron.
2450MHz radiation induces stress and anxiety like behavior in rats (2019)
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Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#72Earlier quoted context omitted.
Not just atoms, you could be hitting something specific in terms of resonance at 2.45ghz. Maybe rats skull size is perfectly resonant at that frequency, who knows.
2.4GHz resonates with water. Thus why it is also used in microwaves to heat our food!
An urban legend. Microwaves cause heating across a wide range of frequencies.
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#73Earlier quoted context omitted.
Not really an answer, but here's some context... In 1952, a paper called Tubes for dielectric heating at 915 megacycles said this, "Dielectric heating can be much faster at microwave frequencies. Because leakage radiation is large enough to interfere with communications, heating is best done at assigned frequencies. The bands at 915 and 2,450 megacycles are most useful." https://ieeexplore.ieee.org/abstract/document/…
Ah, OK, 1947. "The plan which is, recommended by the United States provides for certain discrete frequencies, with appropriate guard bands, for those industrial scientific and medical devices which cannot be shielded effectively. This assures a minimum disruption of vital communication services. The allocation of frequencies for this purpose is justified because of the tremendous investments in equipment and the publ…
I did much of this archival research (and wrote the Wikipedia section) let me know if you have questions.
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#74Earlier quoted context omitted.
To expand, apparently microwaving food right at the absorption peak sucks because of low penetrance, heating only the top layer of the food. The reason 2.4 GHz was chosen was purely as that is where the ISM band already was at the time.
i’m trying to google a better answer, it seems ISM bands were chosen when microwaves were a nascent technology, so it’s a bit chicken and egg
2.6 was chosen based on empirical heat penetration testing for typical target food sizes, e.g. Potatoes.
GE lobbied for 2.4 instead so they could emit a noisy harmonic from a crystal based 1.2 system so the FCC agreed.
Source: national archives documents I researched
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#75Earlier quoted context omitted.
Water has a strong absorption peak at 2450 MHz (it’s what kitchen microwaves use).
microwaves use it because water absorbs it + multiple wavelengths can fit inside the oven for even heating + easy to produce without fancy electronics water can get shaken up by a wide band of frequencies
Microwaves could have used almost any frequency that was cost effective, 2.4 was a compromise to between competing companies and empirical testing.
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#76Earlier quoted context omitted.
There's more peer-reviewing on HN, than the actual peer-reviewing.
Peer review in and of itself is of limited value, and usually reveals cosmetic, as opposed by structural, errors. How many code reviews can be summarized by the letters "L", "G", "T", and "M"? Replication matters. The echo chamber of peer review much less so.
> usually reveals cosmetic, as opposed by structural, errors
I agree, science has become a form of writing and the peer-review will most likely figure out if you are familiar with that form.
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#77A fancy way of saying that microwaving rats makes them warmer and more comfortable. Now where's my $100K research grant?
Oddly enough, microwaving frozen mice was one of the very first non-radar applications of the microwave magnetron. https://www.youtube.com/watch?v=2tdiKTSdE9Y
My father used to serve in the Russian strategic rocket forces in the 70s (the nukes basically, which, ironically, would then be pointed straight where I sit today in the US, since we have some decommissioned ICBM shafts straight in the middle of the neighborhood), and they did a much cruder version of these experiments for "fun". They'd kill rats by throwing them into the path of a particularly powerful and massive radar beam. I doubt rats felt comfortable or particularly non-anxious, however, seeing how they'd be dead before hitting the ground after that.
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#78Even if it was proved beyond doubt that it adversely affected people, nobody would want to hear it. It took half a century to make the case for smoking - and here it's even less immediate cause/effect, and with far larger industries and conveniences assosiated.
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#79Earlier quoted context omitted.
2.4GHz resonates with water. Thus why it is also used in microwaves to heat our food!
An urban legend. Microwaves cause heating across a wide range of frequencies.
Not really:
Consumer ovens work around a nominal 2.45 gigahertz (GHz)—a wavelength of 12.2 centimetres (4.80 in) in the 2.4 GHz to 2.5 GHz ISM band
Re: 2450MHz radiation induces stress and anxiety like behavior in rats (2019)
#80This is a 2019 study. Would be more interesting if anyone else had managed to replicate it. Reading the study doesn’t inspire a lot of confidence in their methods. They make a lot of basic errors like listing dB figures (a relative term) when I think they mean dBmw (an absolute measurement). They tested multiple frequencies but for some reason only 2450MHz showed significant effects. 900MHz and 1800MHz showed no effe…
There's more peer-reviewing on HN, than the actual peer-reviewing.
Most actual peer-reviewing is bogus, facile comments, by people not even bothering to read the paper (when they're not in cahoots with the author and journal).