Quantum Mechanics: The early concepts of quantum mechanics, such as quantized energy levels and wave-particle duality, were initially met with resistance, even by scientists like Albert Einstein, who helped develop them.
Reason for Rejection: The ideas were counterintuitive and challenged classical physics’ deterministic view, introducing probabilistic interpretations of nature.
Adoption: The overwhelming experimental evidence, such as the photoelectric effect, blackbody radiation, and the behavior of atoms and subatomic particles, eventually led to the acceptance of quantum mechanics as a fundamental framework in physics.