{"knowledge_schema": {"broad_category": "Physics \u2192 Quantum Mechanics \u2192 Spin Systems", "refinement": "This problem involves the behavior of a spin-1/2 particle in varying magnetic fields and the resulting dynamics of its magnetic moment.", "specific_scope": "The focus is on the transition of the magnetic field from the +Z direction to the +Y direction and how this affects the oscillation of the z-component of the magnetic moment.", "goal": "Determine the frequency of oscillation of the z-component of the magnetic moment when the magnetic field direction changes."}, "summary": "This problem examines the dynamics of a spin-1/2 particle's magnetic moment when subjected to a change in magnetic field direction. Initially aligned with a magnetic field in the +Z direction, the particle's magnetic moment begins to oscillate when the field is switched to the +Y direction. The oscillation frequency of the z-component of the magnetic moment is determined by the gyromagnetic ratio and the magnitude of the magnetic field, resulting in a frequency of gamma*B."}