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![]() ![]() That comes as no surprise because of course our eyes are evolved to see the radiation light that exists on Earth. The Sun emits power over a range of frequencies but the peak is in the optical (i.e. It turns out various materials have specific frequencies where they do and do not absorb radiation.įor example, glass does not absorb optical radiation, which is why you can see through it. However, power is not the only thing that determines harmfulness. Power $P$ is related to frequency $\omega$ and flux $\Phi$ via There are two factors that determine whether radiation is hamful: flux and frequency.įlux means roughly the number of photons flowing through a certain area per time.įrequency means the frequency of each photon. What is the scientific basis for claiming the radiation has or doesn't have effects on the human body? That's pretty obvious though if you think about the fact that looking at the Sun is painful and would destroy your eyes while looking at a WiFi router is no problem. The Sun is by far the strongest emitter in our daily lives. Let's put all that into a table, but let's make sure we include the frequency of the radiation emitted by each of these sources: +-+-+-+ Wireless routers emits about 0.1 W of power. ![]() Īn average 100 W incandescent light bulb is only about 2.5% efficient so it emits 2.5 W of optical power (the rest is emitted as infrared or ultraviolet as described in the case of the Sun below). Could someone tell me how strong the signals from the wireless devices are compared to those from lights, and perhaps those from the Sun as well?Īt the surface of the Earth, the Sun delivers approximately 1 kW/m $^2$. ![]()
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