2 3 Comprehension Type I Read the paragraph carefully and

Last updated: 7/4/2023

2 3 Comprehension Type I Read the paragraph carefully and answer the following questions Due to very high speed of electrons in atoms molecules etc they show some relativistic effect fine structure of spectra being one of them We know that fine structure was sought to be explained earlier by assuming the spinning of electron about its own axis The quantum numbers now associated with the explanation are called spin quantum number s and magnetic spin quantum number ms for historical reasons only 1 The former is the analogue of for orbital motion but it is restricted to the single unchanged value of 1 2 The magnitude of the spin angular momentum is given by the expression S S 1 1 2 h so for an 2 2 The second quantum number the spin magnetic quantum number ms may take only two values 1 2 and 1 2 These quantum number specify the orientation of the spin with respect to a choosen axis and the component of spin angular momentum along an axis The spin is purely quantum mechanical property and differs considerably from its classical namesake Because the spin state of an electron must be specified if the state of the atom is to be specified fully It is common to say that the state of an electron in a hydrogenic atom is characterized by four quantum number n 1 m and ms the fifth quantum number s is fixed at 1 2 electron this magnitude is fixed at 1 2 h 31 12 The spin angular momentum of last electron of sodium atom is A 3 C 3 1 3h 4 D zero B Which of the following quantum number has not come from non relativistic Schrodinger wave equation A C s B m D n 1 The quantum number 1 2 and 1 2 for the electron spin represent A rotation of the electron in clock wise and anti clock wise direction respectively B rotation of the electron in anticlockwise and clock wise direction respectively C magnetic moment of the electron pointing up and down respectively D two quantum mechanical spin states which have no classical analogue