solarwind escreveu:
> Cell phones emit energy in the form of radiation. There has been a lot
> of "controversy" as to if this radiation is bad for your health or
> not.
>
> The scientists and engineers, of course, say yes, cell phone usage
> increases the risk of brain damage. They also say that the research
> conducted was mainly done by the cell phone industry which is making
> far too much money to let the truth out.
>
> Others say that if there was a real concern, we would know by now as
> cell phones were being used regularly for more than a decade.
>
> I don't think that there's a doubt that radiation in any form causes
> some sort of damage. The question is to what degree.
>
> The average cell phone user does not put the phone to his head (to
> talk) for more than a few minutes a day. But then again, the cell
> phone goes up right against the head when you talk.
>
> I sit in lecture halls with hundreds of students for hours every day.
> Practically everyone has a cell phone, inducing the 2 kids beside me,
> and the 2 in front/back. These phones must still be emitting radiation
> even when not being used (as in people talking into them) as they are
> in communication with cell towers constantly (to check for text
> messages, things like that). What risk does that pose?
>
> What about going into a busy subway station every day with people
> constantly talking on their cell phones around you? Many of them less
> than 1 m away in proximity.
>
> So to what degree does cell phone usage pose a threat?
>
> I thought this would be a good place to post this as you all are
> engineers and have a good understanding of how cell phones and this
> sort of energy behaves on the "physics" level. And I realize I may
> have sounded like a complete idiot writing this post, but please, bear
> with me.
>   =


Don't forget that radiation power decreases with the square of distance.
When you are talking, the phone is perhaps 2cm from your brain. A cell
phone at 1m distance would transmit 1/2500th of that power to your brain.

Also, when talking the phone is transmitting most of the time, and when
idle it just transmits very spaced short bursts.

Regards,

Isaac


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