Calicut University 2011-2nd Sem B.Tech Combined first and b-tech of engineering physics - Question Paper

COMBINED 1st AND 2nd SEMESTER B.TECK examination
ENGINEERING PHYSICS

(1-5 every ques. carry two marks)
1. phenomenon of double refraction in calcite crystal
2. Bragg diffraction equa ion in reciprocal lattice
3. why Population inversion is necessary to achieve in lasing action
4. What is static and dynamic resistance of zener diode
5. Physical meaning of wave function

(6-11 every carries 5mark)
explane
6. Half wave plate,its action on polarized liht incident on it with its electric vector E making angle 'a'with the optic axis of half wave plate
7. a) Derive expression for the distance b/w the atomic planes such as (100) and (110) planes
b)x rays of wave length 0.71 angstrom are reflected from (110) planes of rock salt crystal(alfa=282 angstrom) compute the glacing angle corresponding to 2nd order reflection 8. What is magnestriction effect ,circuit dia of magnetostriction osclitor and working 9. Fermi level modifications with increasing amoumt of impurities in n and p kind 10. kinds of fibre and list out the application 11. IF a 15g marble is moving with speed of 1/3 m/s and is confined over a distance of 12 cm,find the total no of energy level.what do you infer
(12-15 every carries 10 mark)
12. Amplifier characterstics of npn transistor
13. Derive sabines formula for reverburation time
14. Explane why thin film observed in sunliht exhibit colour.when excute thin film of uniform thickness seen by reflected liht shown no colour but appears dark
15. Explane Liquid crystal used as display devie explane with diagram

Earning:   Approval pending.