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What is the frequency (range) used in domestic microwave ovens?

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Guest

Jan 1, 1970
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What is the frequency (range) used in domestic microwave ovens?

Do all ovens use the same frequency?

Is this frequency related with the chemical properties of H2O?
 
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Phil Allison

Jan 1, 1970
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What is the frequency (range) used in domestic microwave ovens?

** 2.45 GHz = 2,450,000,000 Hz

Do all ovens use the same frequency?

** Yes - by law.

Is this frequency related with the chemical properties of H2O?


** It is close to the frequency of the fundamental, torsional vibration
mode of a H2O molecule.

Bit like feeding belly dancers on Ecstasy with 120 beats per
ute -;)





................ Phil
 
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Fred Ferd.

Jan 1, 1970
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What is the frequency (range) used in domestic microwave ovens?

Do all ovens use the same frequency?

yes, otherwise they would interfere with licenses spectrum.

Is this frequency related with the chemical properties of H2O?

yes, its close to it.


802.11b and g are on the same part of the spectrum, so operating a microwave
can interfere with your wireless network.
 
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Gregory Toomey

Jan 1, 1970
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What is the frequency (range) used in domestic microwave ovens?

Do all ovens use the same frequency?

About 2.4 GigaHertz ie 2,400,000,000 cycles/sec
Is this frequency related with the chemical properties of H2O?

Its the frequency of the H-O bond.

A few points to note:

- this is also the same frequency band as wifi equipment. Wifi uses about
0.1 watts, and microwave ovens are generally >500 watts.
- it works ysing a vacuum tube called a msgnetron
http://en.wikipedia.org/wiki/Magnetron
- sci.chem gets regular questions about the "frequency" of atoms. These ALL
come from new age astrologers/crystal worshipers who think crystals have
magic properties.

gtoomey
 
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bin

Jan 1, 1970
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2.4 gigs is one of the water bands ( a couple of them), where attenuation of
signal is great... hence the heating effect.

The band was basically unused because of this (signal dropouts when it
rains) so was made part of the ISM band which regulators made free for use
(no licencing fees). Microwaves of course use it but now all these new
wireless devices are using it cause its free, however it still heats water.

Think about that when you are using your new cooking your head with your new
UMTS cordless phone, and then think about the stink that was made about
mobiles which dont operate in the water band... and hence dont cook nearly
as well

bin
 
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TonyP

Jan 1, 1970
0
bin said:
Think about that when you are using your new cooking your head with your new
UMTS cordless phone, and then think about the stink that was made about
mobiles which dont operate in the water band... and hence dont cook nearly
as well

This is true, but neglects the large difference in radiated power. Cordless
phones have a very short range compared to cellular phones.
It would be interesting to measure the actual heating effects of each
though.
The studies so far on cell phones are inconclusive simply because we don't
know the long term effects yet. Cigarettes were considered safe for a couple
of centuries, asbestos, lead, mercury and radioactive materials too. I'm
betting we know of any statistical effects for cordless phones a lot sooner.
Teenagers are good guinea pigs with high usage of both mobile and cordless
phones.

TonyP.
 
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