The demise of determinism

The idea that an electron should drop from a higher to a lower energy state was, in itself, not unreasonable. However, applying

Newton's mechanics one would expect some reason to cause it to jump at a particular instant. There should be some inner mechanism, perhaps difficult or impossible to observe, to trigger the transition.

According to the thinking of that time, quantum jumps were quite mysterious. There was no evidence to suggest that there was any direct cause and effect in the process. It seemed determine the occurrence of an event, but only the probability of the occurrence of the event. It also appeared that one knew nothing about the system during the transition from one state to another. Such a 'state of limbo' for a physical object was an equally foreign idea.

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