LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

SIXTH SEMESTER – APRIL 2011

CH 6606/CH 6600 – MOLECULAR DYNAMICS

 

 

 

Date : 05-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

Answer ALL questions.                                                                              (10 x 2 = 20 marks)

 

1. Define the terms orbit and orbitals.
2. Calculate the energy of the photon associated with light of wavelength 4000 A^o.
3. Define the term degeneracy of an energy level.
4. What are operators? Give an example.
5. Find the value of ln100!
6. Define thermodynamic probability.
7. What is internal conversion?
8. What is quantum yield?
9. What are thermal reactions? Give an example.
10. What is Photosensitization?

 

PART – B

Answer any EIGHT questions.                                                                    (8 x 5 = 40 marks)

 

11. How is photoelectric effect explained by quantum theory.
12. Explain the energy distribution in Black Body radiation.
13. Explain Zeeman effect.
14. State the postulates of quantum mechanics.
15. Derive on Schrodinger wave equation.
16. Explain Sackur-Tetrode equation.
17. Explain the relation between partition function and energy.
18. Explain the mechanism of photosynthesis.
19. Explain the primary and secondary processes in a photochemical reaction.
20. When irradiated with light of 5000 A^o wavelength, 1 x 10^-4 mole of a substance is

decomposed.  How many photons are absorbed during the reaction if its quantum

efficiency is 10.00 (Avogadro number N = 6.02 x 10²³)

21. Explain Flash photolysis.
22. Discuss the kinetics of photochemical reaction between H₂ and Cl₂.

 

 

 

PART – C

Answer any  FOUR  questions.                                                                 (4 x 10 = 40 marks)

 

23. (i) Derive an expression for energy of an electron using Bohr’s theory.

(ii) State Pauli’s exclusion principle and explain.

 

24. (i) What is the minimum energy that photons must possess in order to produce

photoelectric effect with platinum metal?  The threshold frequency for platinum

is  1.3 x 10¹⁵ sec^-1.

 

(ii)   Derive the expressions for eigen value and eigen function for a particle in one

dimensional box.

 

25. Derive an expression for translation partition function. Mention its significance.                         (7+3)

 

26. Derive Maxwell-Boltzmann statistics. Give its application.                                                            (7+3)

 

27. Explain any two of the following:

(i)    Actinometers                                              (ii)    Phosphorescence

(iii)  Chemiluminescence                         (iv)   Radiationless  transition                             (5+5)

 

28. a) Derive Stern-Volmer equation.

 

1. b) Explain Jablonski diagram.                                                                                                         (5 +5)

 

 

 

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