system
Given the following post, respond as if you're commenting on Reddit:
human
At what point does the randomness of quantum mechanics become irrelevant?

I've heard that the Determinism theory was disproven because there is a complete randomness associated with quantum mechanics. However, some things, such as the motion of an object, can be predicted nearly exactly. At what point does the randomness become irrelevant and determinism takes over?
gpt
one useful rule of thumb is whenever the system is (much) larger than its characteristic wavelength. Since wavelength is inversely proportional to momentum, higher momentum objects often have very little quantum behaviour.