What, do you think, was the reason which motivated Bohr to propose the complementary principle?

Question

Discuss please.

Answer 1

He proposed it for the obvious reason that all the experiments to date EITHER showed the wave properties of matter OR showed the particle properties of matter. So, he reasoned that if an apparatus was set up to look for wave behavior, it will find wave behavior, and vice versa. Heisenberg's Uncertainty Principle expresses this mathematically, but not with such a sharp "either-or". Later mathematical development in quantum physics led to the concept of state functions of conjugate variables being Fourier Transform pairs, which satisfies the Heisenberg Uncertainty Principle.