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Technology Stocks : Qualcomm Incorporated (QCOM)

QCOM 163.33

-1.0%

Nov 25 3:59 PM EST

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To: Maurice Winn who wrote (6710)	12/29/1997 8:09:00 PM
From: John Cuthbertson	Read Replies (1) of 152472

Re: Physical effects of RF Maurice, You wrote, "We can guess that there is some quantum like a light switch below which there is zero effect and above which, hey presto, it all happens." Well, there really is a quantum limit below which a single photon cannot have any internal effect on a molecule, and that limit is the energy difference between its two closest internal energy states. I'm not by any means expert in the molecular physics of DNA, but I would bet that 8 micro eV is well below that limit for DNA molecules. Therefore, single-photon effects "at the site of absorption" really can't happen for these frequencies of RF. The only effect you're left with is energy deposition through heating. As you say, the heating is pretty weak, but maybe it is not completely negligible. To answer your question, UV photons carry several electron-Volts of energy, the exact amount depending on the specific wavelength. ==John

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