Does QM break down at large scales?

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My friend and I were talking , and my friend said that the laws of QM break down at large scales , But i was thinking that they don’t break down the probabilities just become smaller and it becomes harder to use QM . So what do you guys think
 

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Matterwave
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As far as I know I would concur with your opinion. We all have heard sometime in our life that there's the possibility to pass through a wall, even though the probability is so small that the universe would reach the heat death before.

I guess these kind of calculations are made according to the amount of particles in the body that has to pass through such a wall. So I would say that the bigger, the less unlikely to happen.
 
  • #4
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i see , thanks for your answers
 

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