Work Step by Step
Bohr’s correspondence principle says that if a new theory is valid, it must give the same correct results as the old theory, i.e., it must correspond, in any area where the old theory has been verified. Strictly speaking, the correspondence principle was proposed for the overlap between quantum physics and classical physics, so it doesn't apply to macroscopic events. However, we can extend its applicability, and broaden the definition. In any field of knowledge, it is logical that two theories should give matching results in the region where their domains overlap. If they don't agree, then one of the theories must be re-evaluated. For example, if theory A predicts how males will behave in a given situation, and theory B predicts how any human will behave in a given situation, the theories should correspond when applied to a group of males. This is discussed on page 611.