Guru Nanak Dev University 2012 B.Tech Computer Science and Engineering Physics- II - Question Paper
(2412)
Pape r-PHL-198 : Physlcs-II (Same for B. Tech. ECE & EC (System) 2nd Sm.)
Time allowed: 3 hrs. Max. marks 50
Note: Attempt all questions. Each question carries equal marks.
1. (a) Explain and derive Fermi-Dirac distribution law, (6)
(b) Compare the three statistical distribution laws.
2. (a) Using Bose-Einstein distribution law, derive Planks law for black body radiations. (3)
Sr.No.664 1 B. Tech. Computer Science & Engineering 2nd Semestex(UCBS)(b) i. What do you mean by density of states? (I *
Sr.No.664 1 B. Tech. Computer Science & Engineering 2nd Semestex(UCBS)ii. What is the cause of failure of free electron theory? (2)
iii. What is the basic assumption in kronig-pcnncy model? (*)3. Calculate the transmission coefficient of a rcctangubr potential barrier (E < Vr) and discuss the physical phenomenon, which is explained on the of IcaLace through barrier. (10)
4. Explain with necessary diagrams three processes of ataorption, *porl*ncous emission and stimulated emission. Derive Einstein relations conncctinv; jbrpticn. pofttaneous emission and stimulated emission coefficients. (10)
5. Differentiate between ordinary light and laser light. Explain the action of Hc-Ne bcr with proper energy level diagram. (10)
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