Cleaning With Light

If you’ve spent any time under the sun on a long, hot, clear day, you’ve probably gotten a wicked sun burn. I may have overcooked myself a bit during our nice Easter weekend too. This brings up an interesting thought: what happens to airborne pathogens exposed to the same light? A sunburn is the result of millions of skin cells being irradiated by UV Radiation. Sunlight contains UV, Ultra-Violet, which can cause skin cancer in high enough exposures. It’s not dangerous in the same way X-Rays are, those would be lethal with a few hours of exposure. UV is weaker, but it still wreaks havoc on small cells. Messing With Molecules Let’s start out with some basic physics. We’re going to ignore the whole “particles & waves” thing for now and just say that all light is made of particles called Photons. When you turn on a light, it spews out photons, that bounce off the wall, lose some energy, strike your eye, and then you perceive the ‘color’ of that photon. What happens is the photon rams a cell in your eye with a certain amount of force, it’s energy, and that tells you it’s ‘color’. To the 3 physicists reading this, shut up. I know it’s more complicated. The problem happens when we give that photon more speed, more energy. Eventually, the photon moves too fast for our eyes to detect. It’s not visible light any more. It […]

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