Kurukshetra University 2009 B.Tech Electronics and Communications Engineering Physics-1 - Question Paper

BT-1/D09
Physics-1
Paper : PHY-101(E)
Opt. (1)
Time : 3 hours
Maximum Marks 100

Note: Attempt 5 ques. in all, selecting at lowest 1 ques. from every unit

UNIT-I

1. (a) define the construction and working of Michelson's interferometer. How will you measure the difference it sodium doublet lines? [14]

(b) Newton's rings formed with sodium light ranging from the glass plate and a convex lens are viewed normally. What will be the order of dark rings which will have double the diameter of the 40th dark ring ? [6]

2. (a) explain theory of Plane transmission grating and derive condition for secondary maxima and minima. [14]

(b) discuss Biquartz polarimeter. [6]

UNIT-II

3. (a) discuss temporal and spatial coherence of Laser beam. provide description of Semiconductor laser. [14]

(b) define the different applications of Laser. [6]

4. (a) define the construction of Optical fibre. discuss numerical aperture, critical angle and acceptance angle. [14]

(b) discuss the terms Single mode and Multimode fibres. [6]

UNIT-III

5. (a) Derive Maxwell's formula and provide its physical significance. [14]

(b) Write a note on poynting vector. [6]

6. (a) elaborate the 3 electric vectors in dielectrics ?Explain them and obtain relationship ranging from them. [14]

(b) explain the behaviour of dielectrics in an alternating field. [6]

UNIT-IV

7. (a) Deduce the Relativistic velocity addition theorem. Show that it is consistent with Einstein's 2nd postulate o special theory of relativity. [14]

(b) The total energy of a particle is 4 times of its rest energy. compute the speed of the particle. [6]

8. (a) define the construction and working of a Nuclear reactor and discuss the terms neutrons cross-section ant reactor criticality ? [14]

(b) Distinguish ranging from Fission and Fusion. [6]

Earning:   Approval pending.