That's true for massless particles, but not for massive particles.maxverywell said:I read somewhere that the spin is always parallel to the direction of motion of particle.
Spin is a quantum property of particles that describes their intrinsic angular momentum. It is a fundamental characteristic that determines how a particle behaves in a magnetic field.
Angular momentum is a classical concept that describes the rotational motion of a physical object. Spin, on the other hand, is a quantum property that describes the intrinsic angular momentum of particles and is not related to actual physical rotation.
No, the spin of a particle is an intrinsic property that remains constant throughout its existence. However, the direction of the spin can be altered by external factors such as magnetic fields.
The direction of motion of a particle is influenced by its spin. For example, particles with half-integer spin (such as electrons) will have their direction of motion affected by external magnetic fields, while particles with integer spin (such as photons) will not be affected.
Spin is typically measured using a technique called spin resonance. This involves applying a magnetic field to a particle and observing how it responds. The frequency at which the particle's spin changes direction can be used to determine its spin value.