(As my colleague Charles Arthur once pointed out here, the wavelength of Wi-Fi signals is the same as the cosmic background radiation: 12cm. At normal operating distances, Wi-Fi's intensity is generally so low that it's not worth worrying about: it's just part of the "smog" that is generated by radio and TV signals, AC mains wiring, the motors in home appliances, and the universe in general. In other words, the signal strength falls off very rapidly. Since radio waves follow the inverse square law – like light, sound and gravity – then each time you double the distance, you get only a quarter of the energy. Wi-Fi routers operate at very low voltages, broadcast in all directions, and are used at relatively long distances. The oven is a targeted device that operates at very high voltages and short distances. The longer answer is that the intensity of a Wi-Fi signal is around is 100,000 times less than a microwave oven. Is having a baby alarm in your home not like leaving your microwave door open? In fact, we could rephrase your question and pretend that you'd asked about baby alarms, radio-controlled cars, cordless (DECT) phones, Bluetooth headsets, security alarms and loads of other things that operate in the same unlicensed radio frequency band without causing concern. If it is possible for a microwave oven to interfere with Wi-Fi signals – I just read something like that on your blog – because they operate at the same frequency, is Wi-Fi then not dangerous to your health? Would having Wi-Fi in your home not be like leaving your microwave door open? Hermie This is a question that comes up from time to time, and the short answer is no.
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