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Q: Are there examples of quantum mechanics that can be seen in every-day life, or do they only show up in the lab?
What we consider to be “classical mechanics” is just a special case of quantum mechanics (a large-scale, non-coherent case). Observing quantum effects in matter is difficult, but we see it in light so much that we think it’s normal (which it is, I suppose). This include things like lasers (Bose-Einstein statistics), tunnel diodes (quantum tunneling), LED lights, and of course exotic stuff like quantum computers. Already it’s practically impossible to describe radio waves in terms of particles. It so happens that if vertically polarized light hits water at about 37° none of it will be reflected (this is called “Brewster’s angle“).
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