Sree Narayana Guru College of Engineering and Technology 2005 EN2K 103A : ENGINEERING PHYSICS(A), Improvement test - - Question Paper

Improvement test - May 2005

EN2K 103A : ENGINEERING PHYSICS(A)
(For ECE,CSE and EEE)

Time: 2Hours Marks: 50

Part A: ans all ques.


1 What is piezoelectric effect? discuss with a circuit diagram, the generation of
ultrasonics using a piezoelectric oscillator.
2 find the expressions for Einstein coefficients
3 What is a hologram? elaborate the special features of a hologram over a photograph?
4 compute the energy difference in eV ranging from 2 energy levels of neon atoms of a He-Ne gas laser, the transition ranging from which outcomes in the emission of light of wavelength 632.8nm
(4x5=20)


Part B: ans 3 ques.


5 Derive time dependent and time independent Schrodinger’s wave equations. (10 Marks)

OR

6 Outline the simple theory of e.s.r. discuss e.s.r. spectrometer. provide main applications of e.s.r (10 Marks)

7 (a) explain the signal distortion in optical fibres (5 Marks)
(b) Mention the advantages of optical fibre communication over other conventional
kinds of communication (5 Marks)

OR

8 (a) discuss numerical aperture and acceptance angle in optic fibres. provide the relation
ranging from them (7 Marks)
(b) Distinguish ranging from step index and graded index fibre (3 Marks)

9 (a) discuss fermilevel and degenerate semiconductor (5 Marks)
(b) discuss the characteristics of a laser beam (5 Marks)

OR

10 discuss the working of ruby laser and He-Ne laser (10 Marks)

Earning:   Approval pending.