BSc Physics SEM V 2016 17 2016-17 Physics Paper III Automic & Moleculer Physics Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q2 (a) Attempt any one. 10 marks
   • (i) Discuss LS coupling for two electron atom in detail. Find spectroscopic terms for an atom having s electron and p
   • (ii) Show, quantum mechanically, that an electron undergoing a transition from energy level E a lower energy level E, emits a radiation of frequency V =
   • (b) Attempt any one. 5
   • (i) Define symmetric and antisymmetric wavefunctions. Explain, Calculate angle between vectors J and L in state
2. Q3 (a) Attempt any one. 10 marks
   • (i) What is Normal Zeeman Effect? Give quantum mechanical explanation of Normal Zeeman
   • (ii) What is Paschen-Back effect? Illustrate Paschen-Back effect
   • (b) Attempt any one. 5 of vectors- S, L, J, and py 2 (ii) What is anomalous Zeeman effect? Draw vector model diagram = to represent it
3. Q4 (a) Attempt any one. 10 marks
   • (i) State Franck-Condon principle. Using the principle, discuss the intensity pattern of electronic bands
   • (ii) What is Raman effect? Explain it using the polarizability of
   • (b) Attempt any one. 5
   • (i) Write a short note on vibration-rotation spectrum of a diatomic
   • (ii) In a CO molecule, the bond length is 1.13 x m and the masses of C and O atoms are 1.99 x kg and 2.66 x kg respectively. Calculate the energy of
4. Q5 (a) Attempt any one. 4 marks
   • (i) Normalise the wavefunction = and hence find the
   • (ii) The natural frequency of CO molecule is 2 x 108 Hz Calculate the zero point energy. h = 6.63 x Js
   • (b) Attempt any one. 6 4
   • (i). State Hund’s rule and show that O has two unpaired Gi) A beam of enters a uniform magnetic field 1.8 wb/m? Find the energy difference between the electrons whose spins are parallel and antiparallel to the field
   • (c) Attempt any one. 4 4 (i) A sample of certain element is placed in a magnetic field of 0.3 How far apart are the normal Zeeman components of a spectral line of wavelength 4500 angstrom?
   • (ii) Show that the Lande’s g-factor has a value 1.5 when Illustrate it by giving two suitable examples along with their Attempt any one. 3
   • (i) When a radiation of frequency 549.5 x Hz was scattered by a medium, the Raman spectrum showed a radiation of frequency 557.4 16% Hz. is it Stoke’s line or antistoke’s line? Determine the wavelength of Stoke’s line
   • (ii) Homonuclear diatomic molecules do not exhibit vibrational and rotational spectra but they exhibit Raman spectra. Explain

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