A. The beam is split into two beams with opposite spin components in the x-direction. B. The beam is split into two beams with opposite spin components in the y-direction. C. The beam is split into two beams with opposite spin components in the z-direction. D. The beam remains unchanged.

A. To remove the infinite self-energy of particles. B. To introduce the concept of antiparticles. C. To ensure the Lorentz invariance of the theory. D. To account for the spin-statistics theorem.

A. It represents the uncertainty principle. B. It determines the energy eigenvalues. C. It is a measure of the particle's spin. D. It is a constant of motion.

A. The phenomenon where a wavefunction spreads out over time.. B. The process of normalizing a wavefunction.. C. The sudden transition of a wavefunction into one of the eigenstates upon measurement.. D. The interference pattern created by a superposition of wavefunctions..

A. It states that the position and momentum of a particle cannot be measured at the same time.. B. It implies that the product of the uncertainties in position and momentum measurements is always greater than or equal to ā / 2.. C. It suggests that particles do not have definite positions and momenta.. D. It is a consequence of the wave-particle duality of light..