Question

Two values of spin quantum numbers i.e.$\pm 1/2$ and -1/2 represent :

• A. Up and down spin of the electrons respectively
• B. Two quantum mechanic spin states which refer to the orientation of spin of the electron
• C. Clockwise and anti-clockwise spin of the electrons respectively.
• D. Anti-clockwise and clockwise spin of the electrons respectively.

Answer 1

The correct option is B Two quantum mechanic spin states which refer to the orientation of spin of the electron

Two values of spin quantum numbers i.e.+1/2 and -1/2 represent the orientation of spin of the electron. Electrons behave as they were tiny charges spheres spinning around an axis. This spining gives rise to a tiny magnetic field. Since, spin angular momentum of the electron is a vector quantity that can have two orientations relative to the chosen axis which are called two spin states of the electrons as +1/2 or –1/2.