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HOWTO, Cook an Egg With Your Cell Phone 337

Posted by Hemos
from the the-joy-of-technology dept.
xPosiMattx writes "Suzzanna Decantworthy published an article in her Wymsey Weekend column that described how to cook an egg with two cell phones. From the article: "Many students, and other young people, have little in the way of cooking skills but can usually get their hands on a couple of mobile phones. So, this week, we show you how to use two mobile phones to cook an egg which will make a change from phoning out for a pizza.""
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HOWTO, Cook an Egg With Your Cell Phone

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  • Not so fast there. (Score:5, Insightful)

    by Mrs. Grundy (680212) on Monday February 06, 2006 @06:57PM (#14655610) Homepage
    FTFA:

    6. Phone A will now be talking to Phone B whilst Phone B will be talking to Phone A.

    I love urban legend as much as the next guy, but this isn't exactly true. These are cell phones not two-way radios. Phone A will be talking to a cell phone tower, whilst phone B is talking to a cell phone tower, whilst each cell phone tower is talking to the two phones respectively. There is no reason to think that you are forming some sort of ultra powerful death beam between the two phones by placing them in close proximity to one another. Having said that, if I was being attacked by a giant stay puff marshmallow man, I might give this a shot as a last resort.

  • Peak power (Score:3, Insightful)

    by PIPBoy3000 (619296) on Monday February 06, 2006 @07:00PM (#14655651)
    Plus, the phones try really hard to minimize the amount of energy they use. 2 Watts is peak power consumption. I wouldn't recommend trying this experiment unless you want egg on your face.
  • by crmartin (98227) on Monday February 06, 2006 @07:26PM (#14655847)
    Uh. Huh. Let's see ... an egg is, oh, say 50 grams. So it takes 50 calories to raise the temp of the egg by 1C. and a hard-boiled egg is more or less at equilibrium with boiling water, so the minimum would be something like 70×50 calories, and 4.2 joules/calorie, so its going to take MINIMUM 14,700 joules.

    60 joules to the watt-minute. 720 joules in 12 watt-minutes. 720 joules < 14,700 joules.

    Check: it takes about 1 minute for my 700 watt microwave to cook 1 egg. 700 watt-minutes is 42,000 joules. 720 joules < 42,000 joules.

    I call bullshit.
  • by DSP_Geek (532090) on Monday February 06, 2006 @08:30PM (#14656217)
    I beg to differ. Analog phones (and digital ones for that matter) scale the transmitter power output according to the received signal strength, or when the base station tells them to bump up the transmitter. The modulation scheme being FM has nothing to do with it.

    As to believers of the original article, eggs average around 50 grams in weight. It takes one calorie to raise the temperature of a gram of water by one degree Celsius. One calorie = 4.184 Joules (let's say 4.2 because this is a rough approximation anyway). Room temperature is 20 Celsius, so the difference to boiling is 80 degrees C. You need 4000 calories to bring an egg up to boiling (50 gms * 80 degrees C), or about 17000 Joules. Since a joule is equal to a watt-second, that means your average phone with 1 watt output would need about 4.5 hours to raise the egg to boiling temperature, assuming NO other losses.
  • Re:Peak power (Score:3, Insightful)

    by Bruce Perens (3872) * <bruce@perens.com> on Monday February 06, 2006 @09:04PM (#14656429) Homepage Journal
    US handheld phones only get to 600 miliwatts and I doubt British ones get higher. And you would need a higher frequency to cook and egg. The slashdot editor got hoaxed.
  • by JourneyExpertApe (906162) on Monday February 06, 2006 @09:15PM (#14656488)
    If you haven't figured it out yet from the other comments, the article is bullshit. This wouldn't cook an egg, much less do it in three minutes like it says. The bloggerette who wrote it should really go back to posting about shoes and fashion trends and such. Hemos should go back to being the incompetent jackass that he is.
  • by barawn (25691) on Monday February 06, 2006 @10:43PM (#14657060) Homepage
    1) Cell phones are the wrong frequency. They are 800, 900, 1800, or 1900 MHz depending on the service. To make water heat up, you need to be at the frequency water resonates which is 2.4GHz.

    Why does this myth persist? I have no idea. Whenever it pops up, someone points out that it's not true. But it still persists. It doesn't even make sense, after all - microwaves heat dry things (like... plates) as well as wet things.

    Microwaves work via dielectric heating [wikipedia.org], which is just the vibration of any electric dipole due to any electromagnetic radiation. Radiation in the gigahertz band is typical, but it's a wide band. Microwave ovens use 2450 MHz because it's in the ISM band.

    Water does heat best, but that's because it's one of the strongest dipoles known to exist.

    Water vapor has a resonant frequency at 22.235 GHz [brucegary.net] and 183 GHz. You can see the 22 GHz line in the graph on the linked page. Also of interest is the fact that clouds don't have that absorption feature because liquid water droplets are small compared to microwave wavelengths.

    Note that if water's resonant frequency was 2450 MHz, absolutely no one would use that band, as you couldn't transmit anything on it, because water vapor in the air would be opaque to it.
  • by X0563511 (793323) * on Monday February 06, 2006 @11:36PM (#14657381) Homepage Journal
    Doesn't matter. Phone antennas don't "beam" the radio, they broadcast omnidirectionally. Two phones equates to twice the radio energy between them.
  • by rjshields (719665) on Tuesday February 07, 2006 @04:01AM (#14658345)
    You have brainiac in the US? HAHAHAHAHAHAHAHA

    I know you have a lot of crap on TV over there (actually pretty much exclusively crap), now you have our crap too.
    the people who make it think they're the coolest, funniest, sexiest people in the world. What they don't realise is that they're actually English.
    It may have escaped your attention that the terms "American" and "humour" are mutually exclusive. We're better than you, get over it ;)
  • by 91degrees (207121) on Tuesday February 07, 2006 @08:55AM (#14659246) Journal
    It's not about science. It's about explosions, tits and silliness.

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