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Does a black object absorb ALL EM radiation or does it just absorb the wavelengths from the visible light spectrum? Does light that reaches the surface of the earth contain less of the harmful EM radiation that travels through space, and is ozone the only protective layer we have?
Question Date: 2017-04-18
Answer 1:

The color is simply the result of reflected electromagnetic radiation to our eyes. The visible lights such as red, green, yellow are simply the electromagnetic radiation that can be perceived by our eyes and they are slightly different in wavelength. By definition, the color black means that all of the visible light are mostly absorbed equally, leaving little visible light reflected to our eyes. It doesn't require the absorption of all EM waves

Yes, as a result of the O2 and O3 in the atmosphere, a lot of harmful EM radiations, especially the Sun's ultraviolet radiation, are absorbed before reaching the surface of the Earth. Ozone is not the only layer that is protecting us, however it is the most effective layer of screening the harmful ultraviolet radiation. The O2 in the Stratosphere could also absorb some of the harmful radiation, but not as effective as the ozone.



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